---
title: .NET Core Starter
slug: net-core-starter
published_at: 2020-04-23 14:33:07 +0000
updated_at: 2023-01-30 22:51:14 +0000
summary: 
description: In this edition of Stripe Developer Office Hours, follow along as CJ Avilla walks through the fundamentals of .NET Core and how it's used with Stripe Samples and Developer Office Hours.  ## Resources  - .NET Core https://docs.microsoft.com/en-us/dotnet/core/ - curl command line tool https://curl.haxx.se/ - DotNetEnv https://github.com/tonerdo/dotnet-env - Stripe.net https://github.com/stripe/stripe-dotnet/ - Stripe Webhooks Guide https://stripe.com/docs/webhooks/build - Stripe Event Types https://stripe.com/docs/api/events/types - Code: https://github.com/stripe-samples/developer-office-hours/tree/master/starter  ## Table of contents  0:05 Introduction 2:00 Skip to the end with Stripe CLI 3:29 Initialize project 3:39 Implement simple client 5:35 Create webapp with Stripe CLI 6:32 Update launch settings 7:30 Load environment variables 10:47 Update Startup.cs 12:45 Setup StripeOptions settings class 15:24 Create billing controller 18:00 Create GET route on server 22:40 Make GET request from client 24:20 Make POST request from client 26:50 Create POST route on server 35:08 Make API requests to Stripe 39:35 Configure webhook endpoint 47:58 Test webhooks with Stripe CLI 54:00 Conclusion  ## Presenter  CJ Avilla, Developer Advocate at Stripe - https://twitter.com/cjav_dev  ### Support  If you have a question, please feel free to reach out to our support team on Discord at https://stripe.com/go/developer-chat.  ### Updates  Sign up to stay updated with developer news: https://go.stripe.global/dev-digest  ### Feedback  If you have any feedback about this or other episodes, let us know: https://forms.gle/VjNqzRhotM2snYo88. #Stripe #Payments
tags: [stripe, payments, .NET Core, ASP.NET, Getting started with .Net Core, @cjav_dev]
views: 5959
author: CJ Avilla
url: https://www.cjav.dev/videos/net-core-starter
youtube_url: https://www.youtube.com/watch?v=2-mMOB8MhmE
youtube_id: 2-mMOB8MhmE
embed_url: https://www.youtube.com/embed/2-mMOB8MhmE
thumbnail_url: https://i.ytimg.com/vi/2-mMOB8MhmE/hqdefault.jpg
type: video
---

# .NET Core Starter

*Published: April 23, 2020*
*Views: 5959*

## Watch

[Watch on YouTube](https://www.youtube.com/watch?v=2-mMOB8MhmE)

[![.NET Core Starter](https://i.ytimg.com/vi/2-mMOB8MhmE/hqdefault.jpg)](https://www.youtube.com/watch?v=2-mMOB8MhmE)

## Description

In this edition of Stripe Developer Office Hours, follow along as CJ Avilla walks through the fundamentals of .NET Core and how it's used with Stripe Samples and Developer Office Hours.

## Resources

- .NET Core https://docs.microsoft.com/en-us/dotnet/core/
- curl command line tool https://curl.haxx.se/
- DotNetEnv https://github.com/tonerdo/dotnet-env
- Stripe.net https://github.com/stripe/stripe-dotnet/
- Stripe Webhooks Guide https://stripe.com/docs/webhooks/build
- Stripe Event Types https://stripe.com/docs/api/events/types
- Code: https://github.com/stripe-samples/developer-office-hours/tree/master/starter

## Table of contents

0:05 Introduction
2:00 Skip to the end with Stripe CLI
3:29 Initialize project
3:39 Implement simple client
5:35 Create webapp with Stripe CLI
6:32 Update launch settings
7:30 Load environment variables
10:47 Update Startup.cs
12:45 Setup StripeOptions settings class
15:24 Create billing controller
18:00 Create GET route on server
22:40 Make GET request from client
24:20 Make POST request from client
26:50 Create POST route on server
35:08 Make API requests to Stripe
39:35 Configure webhook endpoint
47:58 Test webhooks with Stripe CLI
54:00 Conclusion

## Presenter

CJ Avilla, Developer Advocate at Stripe - https://twitter.com/cjav_dev

### Support

If you have a question, please feel free to reach out to our support team on Discord at https://stripe.com/go/developer-chat.

### Updates

Sign up to stay updated with developer news: https://go.stripe.global/dev-digest

### Feedback

If you have any feedback about this or other episodes, let us know: https://forms.gle/VjNqzRhotM2snYo88.
#Stripe #Payments

## Transcript

[Music] in this episode we cover foundational topics and dig into the basics of dotnet core with the Newton soft JSON and controllers from MVC how it works in how we use this as a base for developer office hours episodes and also for some of the stripe samples which is a collection of github repositories demonstrating integrations with many different stripe products so you might just be getting started and are curious how to build an application from scratch to take your first online payment so this episode is going to cover some basics to help you quickly get started with dotnet and MVC now if you've already got a back-end set up and are comfortable adding new routes and are looking to add maybe a new stripe integration you might want to check out some other office hours episodes where we show how to integrate specific stripe of products and features so why MVC and why dinette core this allows us to keep the code for a demo concise while also showing a working cross-platform example and so it also I wanted to mention it might be helpful to watch and refer to two other episodes before watching this one first an episode about managing environment variables with dotnet specifically we used dotnet End and the second being an introduction to the stripe CLI so as a quick agenda for today we'll cover the following how to set up a basic client HTML with some static HTML and striped GS included then we'll implement a basic server adding get and post routes and finally we'll wrap up showing how to add a post route using your or as your web hook handler welcome back again I'm CJ a villa developer support engineer here at stripe so let's jump into the code now if you wanted to start from or if you want to just like kind of jump to the end and work with the boilerplate that we're going to create today and your terminal you could use the stripe samples to install this base so stripe samples list will show you the list of all the different stripe samples that are available and you'll find one called stripe developer office hours so today I'm going to say stripe samples create developer office hours and that will install the developer office hours stripe sample and there's a dotnet sample and so this is what we're gonna build today so if you if we jump into developer office hours and kind of explore the code there's two directories a client directory that just has a very simple index.html file and then the server directory which contains all of the code for the server so you'll notice that the B client HTML and the client-side code lives outside of the directory for the server and that is because we want to separate those concerns apart that makes it a little bit odd when working with a dotnet application but it works really well to demonstrate all different servers so we showed node and Python and Ruby and a few other back-end languages and so by separating these apart we can show you how to just implement the server-side portion for dotnet so we have this server directory we're going to make some changes in programs start up in the properties and the launch settings and then we will add models and controllers and some configuration so this is kind of where we're gonna where we're headed let's go ahead and get started I'm gonna just remove I'm gonna remove that whole directory and then just start from scratch so we're going to make a client directory and a server directory and then I'm gonna add the basic HTML here in the client so we're gonna say this is for developer office hours and we're gonna add some demo CSS and just like very simple body here is just gonna have an h1 tag and then typically as part of office hours we will install stripe J s so that works like this we say stripe J s and we use this script tag and we always want to load the stripe J s client-side SDK directly from J s the stripe calm it's important because updates are going to be published to that file that's hosted at G s that stripe dot-com so you don't want to like in like download this or included in any build process or anything you want to load it directly from JSTOR calm the second thing we typically do is write either an inline script tag now often in a lot of the samples you'll see that there's a script tag that lives in the project directory and we refer to it using script source in most office hours episodes will write the script tag directly in line here so here very on most of our demos were somehow interacting with the with the user on the client either by redirecting to check out or tokenizing some payment details with elements so we are often using this stripe object so here we're initializing a new instance of stripe passing in our publishable key and this isn't the best practice because we want our publishable key or we can we can make it a little bit more reliable if we're able to roll that key so just in terms of an example today our first to do will be to load this publishable key from the server okay so I want to go spin up the entire server and then this will be kind of like our first thing to wire up is making a request fetch request from the client to the server to retrieve some JSON data back so let's go do that now so I'm going to jump into the server directory and I'm going to use the dotnet CLI to install a or to create a new application call and it's going to be of the web app like base template so I'm just gonna say dotnet new web app and yep so that's going to create a brand new dotnet application that uses the web app template and this is just because this will get our startup code and the program kind of like base base line code to a point that's closer to what we want eventually so once we've created that it has this pages directory and it also has this www root we're not going to use either of those so I'm just going to remove pages and WW root okay the other thing that I want to do before we open this in visual studios is edit the properties for this launch so that the application URL is for two for two so for the HTTP version the the non-secure we're gonna go four to four to four and then for the secure version we're gonna use for two for two so for the application URL we want to use for two for two for the secure and for two for two for for the non secure this is one of the ports that we share across all of the samples and it also matches up with our like test card alright now that I've got those changes made I'm gonna open this project in Visual Studio so I'm going to say open server CS proj and this is gonna open in Visual Studio for Mac so this is like the full the full Visual Studio not Visual Studio code so that's kind of what I'm working in today and the first thing I want to do is go in and make some changes to program CS so there's a couple things that need to happen here so right now programmed at CS in this create host builder we want to load our environment variables from a dot end file so in the in the root of all office hours' repositories so if we go to developer office hours here in the root of all developer office hours repositories and samples you'll find this dot n dot example so this is the form that you need to you know implement your den or your dot n file so I'm gonna copy mine in directly I have I have a copy that has my that has my striped keys so I'm going to copy that into the server directory and we want to load that so the first thing I'm going to do is change this from being an anonymous sort of lambda function into being a full function and we still need to return this as the value and then I'm also going to call dot net and dot and dot load to load our environment variables now it looks like this does not exist so this is reminding me that I need to install some dependencies so we're going to go up to our manage NuGet packages and we have a few dependencies that we want to install the first one is this dotnet and package something to search for that and add net end I also want Newton soft JSON okay so that's their and I also want the Microsoft asp net core NBC Newton soft JSON and we can talk about that in a bit and then finally want to install striped net so I type in striped uh net and select that and now I can add all of these packages to the server project that's exactly what I want okay so it's adding those packages while it's adding those the other change that we need to make here to program CS is okay so we're loading our environment variables and then we are configuring this built the the host the web host defaults and one of the things that we want to do is we want this web builder to host static files from that client directory and since that's in a non-traditional place it's not in www root it's up one two right one up one have folder and over we want to say web builder dot use web root we want to pass in dot dot slash client okay so in practice we're not actually going to pass this string here because it's up to you where you want to implement that client so we might have this client in you know you might want to keep using WW root or something else so we actually load this from the environment variable so we can just say environment dot load no dot in get an environment variable static dur so in the static directory or the environment variable that is named static directory will contain that dot dot slash client for us today okay alright so this is going to configure our default host builder and that is looking great the next thing we need to do is go into our start up to our start up dot CS file and make some changes here alright so we have in under configure services right now it's adding razor pages but we deleted the entire razor pages directory and we're not going to use razor pages because we're going to implement our own HTML so instead we're going to use controllers with views add controllers with views okay that'll be the first change and then instead of using static files here we want to use file server that's the next change okay so that's looking pretty good what else do we have here oh yes instead of mapping razor pages we want to use the controller one so map controller route and this takes a name for default and then I believe this is a pattern which matches controller equals home and action equals index and then the ID which is just like optional okay so I think these are the changes that we want to make all right so that gives us our program and our start up with like really bare-bones basics so let's fire this up and see what happens okay we've got both of those are saved all right everything's looking good we've got some console logging happening here I don't see any errors okay so this is our page it loaded up it looks correct we've got some client HTML here we did not have the button yet but here's some client HTML and if we use if we right click and go to inspect or say a command option I or open up the chrome developer tools here we'll see that our code is loading successfully and this looks this all looks totally great this is perfect so this is working as expected all right so let's go add a here for some more configuration so we want to create a object that represents the options the stripe options so that we can use dependency injection to inject this object and then you know request access to that object within within our controller action so we want to add a new configuration here we're going to say something like services dot configure and we're gonna pass in stripe options so this is going to be a new class that we need to define and this is going to take an anonymous function here so options is this thing and within here we're gonna say options that secret key equals environment get environment variable stripe secret key okay so for now this is sort of like how we want to set up the secret key and inject it so that we can then ask for stripe options in a controller and then we can have access to the secret key so we only have to load the environment variables or really manage with manage the environment variables in one place we also want the publishable key and the webhook secret so these are all gonna be again in the environment variables so here we're gonna pull in stripe publishable key and the webhooks secret stripe okay all right so let's go define this class stripe option so I'm going to make a new directory here called configuration and within configuration I'm going to add just a new empty file called stripe options and in here I'm gonna say public class stripe options and this is gonna have public string secret key and it's also going to have the same thing for publishable key and webhook secret all right let's see if our intellisense this stop-in okay it's stopped yelling at us so that's good all right so now we have configured this stripe options and we are passing down all of our secret keys and our environment variables so this is getting pretty close let's head over to our let's the head over and can create a new directory called controllers and then we'll add a new controller to this file so we're gonna add a new file and this one I'm going to make use of this controller class and we'll call it payments control payments controller you know it sounds good okay so we've got a new payments controller here let's see we're gonna use stripe at some point and we can get rid of this index action here we do want a constructor function so that we can inject those stripe options so we say I option nope I options that's not letting me do that stripe options options and we'll just store this in a on the class directly okay so this is not defined so let's add an a new field yep that looks great okay and then let's also add the reference for extensions okay now we should be set up with our dependency injection to get the options in there let's make a new controller action that will respond with the JSON that contains the public key the publishable key so we want to make this a get request to like public keys and it's going to be a public function that returns action result of a public key response it's just like a new class that we need to define and we'll call the function get public keys okay so we want to return a new public key response that looks like this and it's just going to have public key equals a thing so intellisense is getting mad because I haven't defined this yet so let's add another directory here where we're going to go define this public key response and then work with it in directly here so we're going to add a new directory called models and in the models directory we're going to add a new file and this is just going to be an empty class called what did we call it public key response ok public class public key response and this is going to simply respond with the public key public string public key ok make it just have both getters and setters and that should be fine let's go see what that looks like here ok so now we should be able to use this with intellisense ok that looks good and the public key is going to be this options dot value so we use dot value to grab the actual value out of the option and then we say dot publishable key so this should give us the the publishable key from the environment variables that are loaded and start up and then injected and we've just stored those here so we want to see if this is working so this is how you add a get route is by adding this sort of decorator at the top we can say HTTP GET to tell it what HTTP method to support and then we pass the path or we're defining like the route that we want to receive this ATS or we're specifying public keys to match all of the other samples and so this is kind of how this works and then we're creating this public method called get public keys and we're returning an action result of type public key response so we had to define this class as the the type that we're going to return as our response type and then we're setting up our public key and firing it up so now that the server is running let's go to the terminal and use a tool called curl it's a command-line tool that we can use to test to send a test HTTP request to our local server localhost 4 - 4 - slash public keys should return the JSON for the public key so I see this error this is because we're using a local the self issued certificate and so when using curl you can use the dash K command to say just ignore ignore the public key requirement so we don't see any response so let's go check out and see if we need to save this and then restart or something so I'm gonna save and restart and see if that fixes our request here okay great so we're getting back this JSON response and you'll see that public key in this case looks like public key with a debt with a capital K it's camelcase and that does have our correct public publishable key that's exactly what we're sort of expecting and we want to use this publishable key to set on the stripe client but before we do that I want to make sure that this public key this this the key value in the JSON object is a snake case because that's the convention that we're gonna follow so we need to go back to startup and add some more settings here so we want to go back into startup and we want to set this add controllers with views and we want to add Newton soft JSON and we want to configure some options here with Newton Newton soft JSON so we want to say something like serialization let's see am i okay so I need to use Newton soft JSON serialization and once I've installed that package we want to say something like believe serialization settings let's see all right we need to call it on options dot serializer settings dot contract resolver is a new default contract resolver and in here we want to initialize this with some settings that tell it that we want snake case so here we're gonna say something like naming strategy is a new snake case naming strategy that's right okay so this should make it so that when we restart we are using the snake case naming strategy which is what we want here so I can send the same request and great so now you'll notice that the key in the JSON object is public underscore key you might have another naming strategy that you want to use yet one more change that I want to make is actually let's go ahead and use this and make use of it in our client so we'll go back to our client HTML and then rather than setting this hard-coded here we're gonna use fetch to make a call to public keys it is plural right I believe so and then once the data returns we're going to say stripe equals stripe with data dot public key okay console dot log just straight all right so now we can pull up our browser again refresh the page here so we're making a fetch request to public keys so you can click on a line in the gutter to add a break point all right let's hit play and see if we get that response back we do get data back and it has public key fetch returns a promise that's resolved with this response object response has a method called JSON that we can call that also returns a promise that when resolved will resolve with this object that is a full JSON object that we can access all of the properties on it's no longer just a string and so now we're calling just accessing public key property on that and creating a new instance of stripe and storing it in stripe you'll see a warning here that's safe to ignore it's a well-known well-known issue but it's it will not impact your stripe integration all right so now we're fetching the public key from the server setting it on the client and initializing stripe so that is all looking good let's now create a button here on the office hours page so that when we click the button we were sending a post request back to the server okay so let's go back over here we'll add a button and it'll have the ID button and we'll just say pay will make a big pay button so we need to grab reference to the button so we can say document dot get element by ID and then pass in the ID of the button that grabs reference to that HTML element and then we can call the add eventlistener method on that element to add an event listener for the click button for the button click on the on the button and then we want to say II type prevent default so that we don't end up doing a full page submission of the form so the by saying II type prevent default that prevents the the click event on the button from bubbling up to the forum and submitting a form that it might be inside so we'll use eat uh prevent default because we're going to use JSON and Ajax to send a post request back to our server so now well maybe we'll create a new route call like my route and it will receive a post request with some data and so the way that you can use fetch to make a post request is similar to a get request instead of passing just a single string argument as the first argument you pass two arguments where the first is a string which is the path or the full URL to the route that you want to send the request and then the second argument is an options object that includes the HTTP method that you want to use so we're using posts to send some data and then any headers so we're specifying that this is coming in as application JSON and then a body so here I might want to say something like okay we've got a payment method tokenized on the client here's its ID this is a real test card ID we might say amount they want to buy I don't know 123 quantity they want 45 of those and then maybe there's like an email address Jenny Rosen at example.com now these are all values that you would likely pull out of a form on your page today we're just having a button that you click to show you how to connect your client to your server in terms of making the HTTP request very similarly to the get request it will return a promise goes through this whole process of converting it to JSON and then eventually resolving into this dot then block with the data so this is all looking looking pretty good and in order to test it we need to go back to our server to add a post route so we'll go back to visual studios here and back to our payments controller and now we need to add a post route so in order for this post route to work again it's called my route and we're going to want to receive some we're gonna have some incoming data so we'll call those like my route request and then we're gonna have some outgoing data my route response so maybe before we define my route let's go to find these classes which will help us serialize and deserialize the data coming into the server so in our models we'll add a couple of new files so add a new file empty file and we'll call this my route request and maybe we'll just can we copy this and paste it okay cool and then rename to my route my route response okay so my route request is going to look like this so we had we were passing in the payment method so public string payment method and get said ok we were passing in the email that's the same type and then we passed an integer amount and we passed an integer quantity okay so this is roughly how the request looks and let's see the response is you know what for the response we're just going to kind of echo back the same content but well we'll nest it under like an options property so let's say public my row request is the options that we received okay now for both of these I want to use Newton soft JSON JSON properties very handy so we're gonna add these attribute sort of decorator things JSON property payment method we're gonna do the same for each of these with the JSON property that they're coming in as so this is coming in as email amount and quantity okay so now this is set up pretty well we want our response to similarly use JSON JSON property for this so that we can nest it and that it'll all be figured out for us okay all right so we've got our classes created for our new route our my route okay so let's go ahead and implement that so it's going to be a post post route to my route and it's going to be a function that looks like this it's going to return an action results of my route response and it will have a let's name it my route and now we want to do some model binding to bow to bind the incoming property so we want to say from body and here we define the model that we're gonna the model type that we're gonna bind to so my route request and options okay so these or let's let's call these let's just call it rec okay so we've got this new function called my route and we need to return a new my route response and it has options and those are just going to be the requests the content of the the my route request that came in so it's just those options that are going outbound and let's also do some logging will just say console dot write line and we'll pass in the payment will just like print out the payment method that came in in the request my route called with payment method and then we'll use our RAC payment method so we can just like access those values that came in by calling rec dot payment method ricotta mount or whatever so in the in a post request usually you're creating something so you might be calling a service to create a post or to create a comment or a like or to create a video or something so this is going to be the way that you are receiving data from the client maybe from a form that was posted or from sort of buttons that are being clicked or things that are being interacted with you're gonna receive these post requests to create things on your server you might be making API calls to create payments or subscriptions or customers or what-have-you so this is kind of what our my route looks like let's restart the server and then try testing out my route just using curl so we'll go back to the command line and let's see curl - kay because we don't care about the SSL cert and we want to say - ex-post this tells it which HTTP method to use and then we can use localhost 4 - 4 - slash my route and in order to pass data with curl we use the dash D argument and we're gonna pass a string that has valid JSON so payment method points at p.m. card visa and I think that's all we need to pass for now and then the the last argument to curl that we need to pass is the header specifying that we're sending application JSON so we can use - H with content type application JSON ok so that's gonna send a curl request and we get back the data and that looks exactly perfect it's nested under options you'll notice that it's kind of echoing back what we sent it we sent this payment method p.m. card visa we got back PM card visa so that is that is all well alright let's go to the client and refresh the page and try this from the client so when we click on the pay button we expect to enter this callback function and we're going to prevent default and then we're going to make a network request to my passing all these arguments and then we'll get some data back and we'll just console.log it as success data so I click the button and we correctly entered the block so I'm gonna hit play and now here at the bottom in the log we see success and these options were passed back to us when we say that we were echoed back the payment method email the amount in the quantity so all of that is being passed to the server the server can make some decisions about it and then it's sort of being echoed back to us so this is this is perfect this is kind of what we what we expect the one other thing I want to show you is there's a lot of different tabs in this chrome developer console so the console tab shows you a lot of output you can also inspect things investigate here so you can consult log X or whatever directly in the console you can sort of interact with it as if it were a repple the sources tab is very easy to very very handy not necessarily easy but it's handy to use I use this all the time every day because it's so nice to be able to just click on a line in the number gutter here and then drop into the debugger as you would in any IDE so it's a very awesome the last time I want to show is the network tab there's lots of useful tools in all of these but within the network tab you can see all of the network requests that are happening and if we go down and take actually let's refresh the page and then like you click on pay and here that my route this very last request that happened if we click on that we can see within the headers tab we can see like a breakdown of all the request headers that were sent response headers that were sent and at the bottom we can even see the request payload so this is like the request body that was sent to the server and then if we look in the preview tab this is the content that came back so this is the data that was returned from the server and it gives us in a couple different views so if you are in if you're sending back HTML you can see the preview of the HTML otherwise you can see the raw response here so this is really helpful tools that I use day-to-day and I wanted to share alright let's go make a new route where we can list stripe plans I just wanted to show how we might make an API request directly to stripe okay so here let's just create this this new route welcome only going to get route and we'll call it plans and the idea here is that we just want to fetch all of the plans and turn just the data for for those so this is going to be in a public method and we're gonna make it a sink so that we can use the async features of the striped net library that means we're going to return a task and we'll just call this get plans okay so get plans is going to create a plan create a plan service and then return a wait service right yeah so we're going to return the results from that service so service is a new plan service and we want to return a wait service list async and that's it so this is kind of like we're not even passing any any options or arguments to list async we could limit or we could pass a pass a limit value or we could auto paginate here and loop over all the plans we're just keeping it really simple and making a very simple API request for the planned service now this task is red because it doesn't know what we're returning here so I am actually returning or list async is going to return and away table that will resolve with a stripe list of plan so here what we want to actually do is return a an action result of stripe list of plan okay so the action result allows us to sort of like auto serialize to JSON and then we're returning a stripe list of plan which is the type that we get back from list async one other thing we need to do is we have a couple of options when setting the API key setting our secret API key here we could say something like stripe configuration API key equals options value dot secret key so this is one option so you could option one for setting your API key and then option two for setting your eye API key is to create a client and then pass that down so here we might say something like you know this client is a new stripe client where we've passed in our options dot secret key okay and we're gonna need one of these so if we generate the read-only field okay cool so this is option one this is option two we're going to use option two for now because I wanted to show you that you can pass in this dot client here and this allows you a little bit more flexibility to configure the client and yeah so we could similarly make this injectable and then pull it in so that we could mock it out and inject it during testing for now I'm just going to kind of hard code this and then make our call out to the plan service directly all right so let's restart and make our request to slash plans using curl from the from the terminal here so curl - Kay localhost plans okay and look at that we got back some JSON this is all of our plan data directly from stripe so you might iterate over iterate over those the data that's in the or the the array that's in the data object and print out the IDS or something else so that is how we list out plans so that's looking good and this is really how you make how you would make an API request so if you were to create a you were create a customer created a checkout session or create you know a charge or a payment intent those types of things are gonna happen and it will it might look just like this now some of those will be post some of them will be gets depending on you know how you're implementing that alright let's move on to the the last and final route that we're going to add this is going to be for web hook handling so web hooks are a way for you to tell a third party where to send a post request when something happened so for instance on stripe when a customer is created or when a an invoice payment succeeds these are event types that are going to happen on your account now we have a giant list of event types and we can take a look at them here the if you go to types of events in the stripe API reference here's the list of event types we have a count updated account application authorized and the list goes on it's a massive list of different things that you can automate based on so order created order payment failed order payments exceeded these are all different event types that are going to fire on your account and you can listen for these with a web hook endpoint so the point of a web hook endpoint is to set up a URL tell stripe that URL and then when an event happens on your account you receive a notification with data about that event so the content of each event is going to match the object type that is on the left here so when we have a skewed created event we're going to receive an event notification and the event will have a data property that will have an object property and that object will be a skew object so it is the shape of a skew it has all the data for a skew similarly a refund failed event is going to have data two objects be a refund object so there's going to be a different object type depending on the event notification type that you're receiving so this is this is super handy when you want to automate certain processes and you don't have to use polling so rather than pulling some endpoint and asking you know every maybe you set it up on a periodic basis so that every hour you make a get request to iterate over all the charges or something in your account to see if any of them succeeded or failed so rather than polling you want to use a web hook endpoint to receive notifications and we use web hook endpoints for almost all integrations so very handy tool there's a huge list of event types again that you might want to investigate there so this is going to be a post request and we're going to call the route web hook now if you want more information about web hooks we have a whole nother episode so you can go check that out okay so this is going to be a public endpoint that's going to return an eye action result I'm just gonna we're gonna return just okay from this no users ever actually see this route this route is purely for strike to send you a post request or for any third party to send you a post request so we are going to return okay because in order for the web hook to be or the web hook notification to be mark successful we have to return a 200 status code so anything 300 or above stripe considers that to be an error that means that even a redirect is considered an error because a redirect redirect is 301 so in order to make sure that you are responding with a 200 every time I just gonna I'm just gonna return okay here so what do we actually do inside the web book well we want to grab the JSON the raw JSON from the request in practice this needs to be the most raw version of the the request body in order to do signature verification so we want to save our JSON is a wait new stream reader we pass in the HTTP context for the request in its body and then we want to say like read async or read to end a sink or something like that let's see okay let's import the stream readers that we have our our system yeah system iOS that we have our nice thing here so read to end async okay alright read to the end async alright and then we want to have a try-catch block here so we're gonna save our stripe event or no stripe event is going to be event and then inside of a try/catch block we need to try to actually check the signature verification and deserialize or unmarshal the data that came in for that event and if that fails then we know that signature verification failed so this works like this we say stripe event is event utility dot construct event and we pass in the JSON as the first argument we're gonna pass the signature header which is going to be in the request header under stripe signature and then finally we're gonna pass our webhook secret and so remember because we injected this from our our dot end of environment variables we have access through this options dot value dot webhook secret okay so this should initialize a new instance of a stripe event and this will also verify the stripe signature header so that we know that this event is authentic in that it came from stripe so I see a squiggly underline up here I'm guessing that's because this function is a is not an async function so when you make this async and this should return a task of of I action result okay all right so it's to have to stop yelling at me all right so now we're gonna say if we receive an exception we want to console.writeline you know like failed to unmarshal event data and we want to return bad requests otherwise we want to take some like here's where we're gonna like automate based on event type so one of the event types that might come in is checkout session dot completed so we might say something like if stripe event type is checkout session completed then take these actions and we might say something like you know send an email to the customer we might pull from inventory we might you know ping in slack or something so there's a whole bunch of different things that you might do in order to automate things that happen when a checkout session completes and so here we're just going to like console.writeline that we receive this checkout session with ID yeah a session dot ID completed okay now because we don't have this session yet we need to we need a way to access the event data that came in the stripe event so we want to say something like var session is equal to stripe event data object now this this object data comes in as different types depending on the event type so because we're working on a checkout session completed the object type here is going to be a checkout session if we're working with an invoice payment succeeded the object type is going to be an invoice in order to do this we need to use casting so we're going to cast this event object into a checkout session as checkout session as Striped checkout dot session okay I'm not sure if I need this straight part but okay so this should work we should see the ID of the session see s test blah blah blah all right so let's take a quick look at how we might test this out so we're going to use the stripe CLI I'll start two panes here so the first is going to be stripe listen - - forward - and because we're using HTTP in like the the top level 4 - 4 - route we need to specify the scheme here most of the time when you're working with stripe listen in most examples we show are not going to include that HTTP scheme but with asp.net when you're using the server that's built-in when you just click play in Visual Studio you must pass the scheme so where you say HTTP localhost for two for two slash webhook so you pass the full path that we want to listen to now if you want you can also pass log level debug and you'll see a little bit more info so why don't we do that today will say stripe listen - - log level debug what this does is it sets up a direct connection - from stripe to your machine so that when events happen on your stripe account they will be forwarded to whatever you specify here in terms of localhost so it also prints out your webhooks signing secret I've already saved this in my environment variables okay so we've got some we've got some events that are coming through all right so we are we're up we're listening and now what we want to do is say stripe well let's actually make sure that we restarted our server here and there's another tool within the stripe CLI called trigger you call stripe trigger and you pass the event type that you want to result in or yeah the event type that you want to fire so we're gonna say check out the session completed that's the event type that we want to fire and what happens is under the hood the stripe CLI is making a whole bunch of different API requests that will result in this check out session completed event so in order to get to a check out session completed we need to create a check out session create a payment page go to that payment page create a payment method you know confirm on that payment page and eventually we will fire this checkout session completed a bit so we are seeing all of the events logging on the Left pane here in our stripe listener and those are being forwarded to our local machine so let's go back to our our server log here and see the the results so we see one error here failed to unmarshal event data okay so we entered this this block here because we are failing to unmarshal the event data for some reason all right so let's see if we can figure out what's going on so we are we are parsing our request body we are creating a new event constructing it from the JSON that we got the stripe signature I believe that's spelt correctly and then the webhooks secret okay let's go make sure that we set the webhook secret correctly what book secret is being set up get environment variable stripe webhook secret okay all right that is all looking correct hmm what excites let's just add some more helpful stuff here so console dot log our console that write line e let's just see the whole let's see the whole e can we have a break maybe we can't break point all right let's try this again firing checkout session completed from the terminal we come back over here received event with API version 20 1905 16 but stripe 35 14 expects API version 20 2003 Oh - this is fantastic this is perfect I'm so glad that we ran into this because you might also run into this error so what's happening is that every version of stripe dotnet is pinned to a specific API version on stripe so you can have different versions of SDKs and different versions of the API within your stripe account set up as your default version in your in your stripe account and so what's happening is when we use stripe trigger from the command line and stripe listen from the command line they are using your default API version so by default when we're listening for events and forward forwarding those on to your local web hooks server we're listening to those with the version the API version on your account the default API version on your account so when we receive events with the 2019 Oh 516 version the shape of those events is going to be a little different than the 20 2003 o 2 version and because this version of stripe net is pinned to 20 2003 o to the classes that are defined are going to have potentially different properties than those that are defined in 2019 o 516 so what we need to do is fix our listener to send the versions of the events that are the latest versions so let's go change our event listener here so I'm actually going to remove the log level debug - I'm gonna just pass - - - latest I believe yeah so if we use stripeless in forward - with - - latest that will force the latest API version for all the event all the event objects that are forwarded to our account so then if we try this again we need to we don't need to restart the server we should be receiving them now at the correct API version strike trigger checkout session completed and it's firing there's a whole bunch of requests that are happening and we are looking great alright so those are all firing we can see them here in the console checkout session with IDC s test blah blah blah completed that's fantastic everything is looking good so this completes our demo for today I hope you found that useful if so please hit the like button and subscribe turn on notifications to be notified for future videos if you have any feedback for us please leave it in the feedback form below alright until next time you

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