---
title: Stripe.NET example for server side PaymentIntent confirmation
slug: stripe-net-example-for-server-side-paymentintent-confirmation
published_at: 2020-11-24 13:03:35 +0000
updated_at: 2026-03-04 20:14:40 +0000
summary: 
description: Adding .NET example for server side PaymentIntent confirmation
tags: []
views: 1019
author: CJ Avilla
url: https://www.cjav.dev/videos/stripe-net-example-for-server-side-paymentintent-confirmation
youtube_url: https://www.youtube.com/watch?v=g7k7NIJUc7o
youtube_id: g7k7NIJUc7o
embed_url: https://www.youtube.com/embed/g7k7NIJUc7o
thumbnail_url: https://i.ytimg.com/vi/g7k7NIJUc7o/hqdefault.jpg
type: video
---

# Stripe.NET example for server side PaymentIntent confirmation

*Published: November 24, 2020*
*Views: 1019*

## Watch

[Watch on YouTube](https://www.youtube.com/watch?v=g7k7NIJUc7o)

[![Stripe.NET example for server side PaymentIntent confirmation](https://i.ytimg.com/vi/g7k7NIJUc7o/hqdefault.jpg)](https://www.youtube.com/watch?v=g7k7NIJUc7o)

## Description

Adding .NET example for server side PaymentIntent confirmation

## Transcript

hey folks um we are live i'm going to show or work on um this stripe sample for accepting a card payment uh we built this sample a long time ago about looks like about 13 months ago and we never added a net server example so i'm going to go add in a server written in in.net we're going to use net nvc today um and uh yeah that's that's kind of the plan for today we've got about an hour um so we'll kind of hack on that for a bit also tomorrow we are going to be broadcasting live from the stripe developers channel um a a really fun demo where we built an integration with next js graph cms and stripe checkout so tomorrow yeah if you wanted to drop in and check that out that should be really fun so today we're going to work on accepting a payment here so this is the stripe sample where you can accept a card payment we actually have three different integration types i notice there's some vulnerability so we're gonna have to address those but there's three different integration types we have decline on card authentication we have using web hooks and we have without web hooks so the example without web hooks is actually a way to confirm payment intents server side without without actually presenting any modals or anything client-side so the way that it works is we first create a payment intent and then we attempt to pay that payment intent on the server so it looks like i'm just like kind of reviewing the ruby version here where we are we have like a simple git route that's going to return some index.html we've got a method here to calculate the order amount uh we have a pay method um and then we are creating the so our pay method is like dual purpose here so if we got a payment method id then we are going to create a brand new payment intent and attempt to confirm it server side so this we're doing a manual confirmation on the server um generally this confirmation step happens on the client you start you call stripe.confirmcardpayment on the client and that will maybe open a modal or present um you know present some ui that you can then use to confirm the payment on the client side but when we're doing it server side we want to use the manual confirmation method pass and confirm true this will attempt to confirm the payment intent um and then if the uh this this flag here allows our mobile clients like stripe ios and stripe android to pass in use stripe sdk um which is another argument that will allow confirmation with sdk otherwise if if we're not receiving a payment method id but we're instead receiving a payment intent id to this pay endpoint to slash pay then we're going to try to confirm the payment intent client side and then no matter what we're going to generate a response that has the intent and that response is going to be something like this and we'll return that back to the client notice that we don't have any web hook handling here in most implementations of payment intents you have to have a web hook handler to deal with the successful confirmation of a payment intent that's just like the default flow but you don't have to use a web hook instead you can do this server side confirmation um so yeah so we kind of like attempt to create and confirm but if there is any next action so if the the bank needs you to pre like enter a one-time pin or if you have to be redirected to a bank page or something like that um then we're going to fall back and confirm um with the payment intent ideas like a second step so when we're generating the response we're going to say like if the intent requires action require source action was in an older api version we'll we'll add support for that too if it requires action then we're going to send back that it requires action the payment intent and the client secret if it requires a payment method then we're going to re return with that it was denied because if we attempt to confirm it server side and it requires a payment method it means that we were just not able to use that payment method at all and so we need to collect new card details from the user otherwise it's exceeded and then we'll just pass its client secret to the front end okay so we're basically just going to re-implement this ruby server in net using dot net nbc so i'm going to start from um let's see what do we want to do here yeah let's clone this accept a card payment repository um okay and then inside of here uh without web hooks i'm going to hmm i'm going to use a stripe cli so stripe samples create developer office hours so i'm just going to pull down the developer developerofficehoursbasefor.net that way we have some of the code already written for us i'm going to move developer officehours server into a new directory called.net so okay all right so in our dot net directory here we have our our solution let's just poke around in here and see what we've got going on to start okay so we are loading dot end and this looks like it is almost populated in fact yeah this looks good um okay and then we have some app settings what am i looking for launch settings so these tell us where we're going to start we do want to start on local localhost 4242 and then in startup we don't have okay so let's just launch this um dot net run program dot cs um and that should start up a yeah okay so that started up a new server on localhost four two four two this is what this is not what it looks like uh let's see okay so the static directory should be up and over one because we are um when we install a stripe sample from git clone the client directory is going to be different than if we install it with the stripe cli so i actually need to confirm where okay so client it's actually in client web so in our dot net dot end we actually want to go up and over from client to web okay so dot net run program restart our server and see if we can get this working again so if we come back over here refresh the page hard refresh all right so this looks closer to what we're looking for okay cool so stripe key some stuff is failing this is okay um all right so let's let's hack around here so on in our controller in our payments controller we do not need a web hook so we're going to delete the web hook endpoint um we are still going to initialize a client um but we do need to start adding some other endpoints so why don't we refer directly to this ruby example here and in fact what i think i want to do is write a test where we can assert that this ruby server is starting up and running and returning what we expect when we hit these endpoints in other samples we're using config here instead of stripe key so that's a little odd um but okay so yeah let's do that let's start with some tests so actually r spec knit and then spec without web hooks spec.rb um respect.describe it works it um [Music] okay uh and then our spec helper we generally add some just like some random stuff here not random but uh we've got we've got we've just recently started actually writing tests um and i want to make sure that we're following sort of the same pattern so in our spec helper at the bottom we have kind of these helpful methods um which will load our dot in set our api key server url this for our for the dot net folks sorry this is like we're starting off here with some ruby um uh to be false um but we're right now we're just writing some we're gonna write an automated test that will um uh i will make sure that our our server is running as expected okay what else is required here just grab all these okay cool got a failing test um and what are some examples of tests that we've written yeah so we okay i think we want this to be so if we go into without web hooks um bundle install so we're gonna run the ruby server first just to like get that up and running um okay and we don't need that all right so that that's configuring our got end file the dot end is where we're storing environment variables i know in dot net there's like a separate secrets thing but we're not we're not using that yet okay so [Music] what is this called again in the sample in the sample this is called stripe key and we expect it to have publishable key and let's see if that works okay great so that's making like this is making requests to our locally running ruby server so we're going to try to get the tests passing against the ruby server that's already written and then we will rewrite or then we'll be able to more quickly iterate and write our server in dot net so the we've tested this endpoint here and this end point here the next thing we need to do is test this post request endpoint for slash pay so we need to say let me refer again back over here to this okay so we get the response and the status code when we say post json so in this case we want to pass pay and the very first one we're going to do is it creates a payment intent we call okay the reason i'm the reason that we generally put these all in the same spot um is that if there's if there are api requests that we need to depend on for future api requests then it's nice to have them all in one sort of in one place but i think because um because of the way this is set up i think we can actually use like reasonable um reasonable it blocks here so it um fetches root index page as expected it fetches index page it fetches config it i guess it's not really fetches um creates uh payment intent it's so it's like it serves config serves the index page so that route works that route works and then this route is going to be it's going to fail because we don't have the right params yet okay so we're going to make a post request to slash pay the ruby server is expecting what so it's receiving some json and the very first thing it does is tries to calculate the order amount based on data items so i think i don't like right now this calculate order amount is taking in items but it's not actually doing anything with the items so we can pass just like an empty empty list there to kind of fake that out it's also expecting the currency the payment method id and use stripe sdk so if i pass currency as usd payment method id as pm card visa this is one of our test cards uh test payment methods and that should work fine uh okay so then that should create the payment intent because we're passing payment method id um it should generate a response and we should get something back so our response should be at 200 and um expect that rest to have key what is it going to have in this case it should have it should have succeeded the payment intent should have succeeded so it should only have the key client secret um should not have uh requires action for this for this specific payment method id so if we run this again posting to slash pay okay cool we got back what we expected um creates a successful payment intent pm card visa all right let's pass a card that requires action um a requires action payment intent so if we go to the testing page for um payment methods it's kind of hard to read let me go a little bigger so if you go down to the regulatory test cards there's a couple cards here that will trigger like sort of the secure customer authentication flows or the 3ds flows so we we could use the card number directly but rather than having to like go through and create a payment method which generally happens on the front end with stripe.js and tokenizing that instead what we can do is we can use these payment method ids these test tokens so pm card authentication required on setup this is going to um this should require authentication and we should get a payment intent back that requires action so if we pass that payment method then we should receive this back because our payment intent should be in one of these two states depending on our api version and requires action should be true so expected to have key requires action and payment intent db and client secret and expect resp requires action to be true um okay so let's run that all right so let's run them all cool cool cool uh all right so that looks like it's actually working great um what other states do we need to get to requires payment method the card was not properly authenticated new payment method required so i am forgetting how we get into that state it might be this card try requires payment method so that should have different result i believe nope okay so um i that might be one of the cases where we pass in the payment intent id so what we want to do for this case is i think we want to take this payment intent [Music] from the payment intent after handling authentication on the client right so um okay so actually yeah this is actually a little different than i expected so we do still handle authentication on the client we're just confirming server side without web hooks but we're not actually handling the next actions on the server so this is this is a little different than i expected but we're still confirming server side so okay so let's go check out what um hmm i think yeah so if we yeah i'm trying to think about how we might test these this other use case um confirms uh payment intent so okay so what we want to do is we want to create a payment intent which we're going to do directly through the api we're going to pass an amount and a currency then what we're going to do is update the payment intent to have a payment method so this is what would happen on the server actually yeah let's see um yeah let's do that and then instead of passing in items or currency we just want to pass payment intent id it's equal to pi to id but we need to update payment intent update payment method is going to be pm card visa so we assume this happens on the client um and then when we pass in the the payment intent id to pay we should get a confirmed payment intent back and it should not have any of this it should just have like the success the success case i believe so this should just be um just client secret okay your no key okay yeah let's see so uh spec helper did we oh we probably need a dot end also out here all right we got passing tests that's cool so then if we go back into the spec file and we change this to attempt to confirm with um a pm card authentication required on setup what do we get back okay requires action true okay so we get we still get the required action stuff back okay so that's not actually entering our failure case either so i think these are this is a pretty good um starting point for our test suite so let's kill our ruby server and then go to.net and ruby no dot net run pro actually yeah we want to open up our payments controller and we need to first add a method for stripe key so this is going to be where did it go nope that's not it stripe key yes so how are we doing this in checkout we just want to add a simple get request and it looks something like this but our response is just going to be the publishable key so we need to go to our models and add a new model public key response uh sure how about a stripe key response okay stripe key response and we'll see what we get first of all we should be able to hit this page and we do can and so that test should pass it does now because this pass is not because what did we get back um we got back publishable underscore key so in our public key response if we use uh json property i think um publishable key import are using uh newtonsoft.json does that work uh we might need to crack open visual studio to uh to actually get this working here let's see oh nice okay so that's passing uh there should be no pay in point yet so let's go add that so in our payments controller now this is going to be a post endpoint http post to pay and it's going to be a public async maybe public task a response or i action result no pay response and this is going to be the pay method and it's going to say from body pay request and we got to figure out what goes in here so in our models we need to add a pay request.cs and uh payresponse.cs and our pay request is i believe yeah let's just copy so our pay request what can we take in again let's see for pay we expect items um as a list of something i don't know string maybe and i guess i'm going to have to say using system.collection.generic and what else do we want here we want the currency this is going to be let's see and we also want i think the payment method id i can't remember if the c sharp convention is capital d or lowercase d there but um that should be fine all right so if i recall correctly oh we got items oh wait this is the wrong server um without server ruby server okay items payment method id currency pin with the type i use stripe sdk use stripe sdk all right so i think that's it right yeah okay so we've got our request params those i believe should be bound from the body when we receive this payment request just check and make sure it's from body yep okay but i need to name it so i've given it a type the type is pay request that is this class here so we're creating this model binding so that we can pass stuff in in our request um and i i don't know i think this this this is going to fail because this task is not actually returning anything um i think i need to make this maybe async yeah and this one is just returning an i action result which i think is okay yeah so let's do that for now i'm just going to return okay just so we can get it showing us something um and then i'm going to start the server again and we can run our tests okay crashed good the namespace already contains a definition for stripe key response right because i didn't change this a response a response we're going to come back and make that pretty and update it with what we expect to be returned to us um collection system.collection.generic what is this electron is that it m.collections.generic hey it seems like that worked all right so uh let's run our test and i think that may have worked i think that may have worked it didn't do anything but it didn't didn't crash too hard okay so at least we're building or we're compiling all right so in our response we have this generate response sometimes the return requires action sometimes we return payment intent id client secret error all right so those are the four possible things requires action payment id client secret or error so we need a public client secret is going to be a string client secret and it's going to look like this okay what else we've got here we have a payment intent id that will also be a string oops we have um requires action which is a boolean optional and we have error which is a string okay i think this is technically like optional bull but i don't remember if that's needed for our response stuff or not so well let's just start with this and then see how things go so we're gonna go back to our payments controller and then because in our other examples we have separate methods for generate response let's make a private method here called generate response which will return a hey response and it's going to take in a payment intent and um yeah i'm just gonna copy the logic from here and we will convert it from ruby to c sharp so switch it's a switch statement payment intent dot status um and i need to look up how to do a switch in c sharp c sharp switch statement cool cool switch case colon statement break switch case uh requires no can i do comma oh they're just multiple fall through like this i think and [Music] right okay and if that happens we want to return a new payment uh our new pay response with um this stuff and it's going to be like requires action true what else is it going to be payment intent id sql to payment intent dot id it's going to be client secret is equal to payment intent dot client secret and okay i think that gets us this thing at least um all right so we need a couple more case statements and another payment response and the next one is just going to return error and that equals your card was denied please all right and that is in the case of requires payment method and requires a source the older required source um okay and then finally if it succeeds then we want to pass back the client secret okay and i guess we should make some other case where if it defaults um is there a default yeah default return new pay response where we have an error and the error is like unknown payment intent status and maybe we can put the status in there where we just say like payment intent dot status we're switching on the status if we don't break into one of these we'll just return the status as part of that error i think that should be good so let's say we want to actually like i think we're at a point where [Music] order amount calculate order amount this kind of this this kind of bothers me a little bit um because we are calculating the order amount which is a an integer value but we're just returning 1400 and expecting that you'll kind of like fill that in so let's say um let's name it all we'll name it the same stuff calculate order amount calculate order amount and i think this is expecting items but you know i don't think we have defined what types those items are object of object what about in go what do we do in go we have no go sweet how about typescript items uh list of object all right so in c sharp why don't we just make it like a list of any maybe um yeah i guess we have to change our pay request to make this or yeah our pay request to make it a list of any object ash um yeah what do we want to do here object like generic object type um newton's off json yeah yeah hmm i don't like it list of object okay what is it what is it being passed from the front end let's take a look at the client from the front end in web items is a list of object as id okay so um yeah so this should deserialize into another object type um if we're following the convention but that object type i think has to be defined uh in um in c-sharp so that we can de-serialize a payment request as successful oh this is not fun okay so we don't specify the shape of the type for an item in the other languages but i think we have to define it here so let's say public class pay request item and it has um an id and this will be a list of pay request item then up here i don't know if list of any is gonna work but let's just try it okay so the first thing we do is we say um order amount is equal to calculate order amount of rack dot items okay so that gives us our order amount that's this that's the same as this thing here then we have a try catch block where we are handling card error and just returning with an error message so then we need to try catch block and this is going to be card error and it's returning this is still returning a 200 in ruby which is not really what we want to do but i don't want to make it different so i'm going to stick with return okay so if uh rack.payment intent id else if req.payment i think we want that as a second one actually if there's a payment method then we want to do stuff otherwise if there's a payment intent we want to confirm payment intent uh if there's a payment method we want to create payment intent so here we want to say something like uh let's just look up this looks like in uh dotnet so creating a payment intent in.net looks like that okay so payment intent create options um amount is order amount currency is wrecked wrecked.currency unit method types we did not define in the old or in the existing sample so payment method rack.payment method id confirmation method is equal to manual confirm is true and then use stripe sdk is equal to rec.use stripe sdk let's go confirm this is even in stripe.net so payment intent create options stripe sdk cool use stripe sdk and it is a bool it is an optional pool so in our pay request we can make that an optional bowl i think i mean seems like it should work all right so we got our payment intent service we call create this gives us back a payment intent and then yeah okay otherwise we have our payment intent service and we want to call confirm and we're just passing in to confirm our uh rec dot payment intent id okay and then in both cases we want to take that intent so let's say um payment intent payment intent or just intent up here and then we're going to set it down here let's actually initialize our service up here too and then we don't need to create that both times and return generate response for intent um i don't know do we think it's going to work okay generate response for intent because it needs to return an i action result and that i actually wanted to like uh try making this async a weight i think we can do a weight there we're returning a an async task of i action result so i think we can await those let's see what happens um chances are high i messed something up so line 96 return new pay response uh come on 63 yeah it doesn't like that any does it pay request item um i don't want this a list of pay request item list of payrequest item i need to put this in its own thing a request item dot cs hmm oh no no no no he wasn't mad about that he was mad about not knowing about a list from over here okay i gotta read the error better oh what in the world cannot implicitly convert type string to bool uh request use stripe sdk another one it's talking about um all right so on line 40 in our payments controller line 40. if okay so if this is not null is that a thing is it going to be empty string okay pay request does not contain a definition for use stripe sdk pay request doesn't oh okay trying again fewer errors that's good payment intent does not contain a definition for get a waiter and no accessible extension oh right because this needs to be okay so create async confirm async i believe maybe cannot convert type string to bool on line 52. oh yep i'm not sure if that's going to bring them in as empty string or like be serialized as empty string okay use of unassigned local variable intent 56. oh come on let's find right here signed in the if block okay fine getting warmer not all code paths return of value i do now i think all right uh we've got a few minutes here i think we're going to start wrapping up as i have another call but i had fun i hope you had fun too undefined method http body for unexpected token at blank so i would open this up and i would open up the console to see if there's any errors and i would click around in here to see if we can [Music] make this dance um here's the submit function okay we're preventing default let's step down into the pay function change the loading state sure whatever that does we're going to create a payment method called card and then we are not going to show an error because we don't have an error we're going to set our order data to that payment method id and now we're going to make a post request and to slash pay uh okay and it failed there it failed attempting to parse the result of pay what was the response there let's see pay go okay let me see the pay response oh come on it had something didn't it pay headers i sent you a bunch of stuff and i got nothing back what's going on over here in the pay function console.rightline pay function [Music] order amount all right i'm going to leave it there i will be back hacking around on this and i'll try to wrap it up later hopefully that was somewhat useful and uh yeah thanks for hanging out all right yeah i'm gonna do the full wave come hang out tomorrow we're gonna do some cool stuff with next js graph cms and stripe checkout all right

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