---
title: Accept a payment with perl
slug: accept-a-payment-with-perl
published_at: 2021-02-05 17:00:32 +0000
updated_at: 2026-03-04 20:14:30 +0000
summary: 
description: In this episode, you'll learn how to accept a one time payment with stripe-perl aka Net::Stripe.  Code for this episode: https://github.com/cjavilla-stripe/accept-a-payment-perl  Related blog post: https://cjav.dev/posts/stripe-perl-hello-world/
tags: []
views: 886
author: CJ Avilla
url: https://www.cjav.dev/videos/accept-a-payment-with-perl
youtube_url: https://www.youtube.com/watch?v=fOSXTpzlqts
youtube_id: fOSXTpzlqts
embed_url: https://www.youtube.com/embed/fOSXTpzlqts
thumbnail_url: https://i.ytimg.com/vi/fOSXTpzlqts/hqdefault.jpg
type: video
---

# Accept a payment with perl

*Published: February 05, 2021*
*Views: 886*

## Watch

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

[![Accept a payment with perl](https://i.ytimg.com/vi/fOSXTpzlqts/hqdefault.jpg)](https://www.youtube.com/watch?v=fOSXTpzlqts)

## Description

In this episode, you'll learn how to accept a one time payment with stripe-perl aka Net::Stripe.

Code for this episode: https://github.com/cjavilla-stripe/accept-a-payment-perl

Related blog post: https://cjav.dev/posts/stripe-perl-hello-world/

## Transcript

all right what's up friends uh today i wanted to show you how to use the stripe pearl stripe client library this is a community maintained library thank you so much gerard db for maintaining that for our community and for our pearl users i wouldn't just quick uh make a quick video of how uh how you could set up a server to accept a one-time payment in an sca-ready way so here i've just got an empty directory there's nothing in it um and the first thing i want to do is make a new file called server.pl server.pl and in here we're going to write all of our logic for creating a simple web server with mojolicious which i i love the name and i think that it's very similar to express or sinatra or one of these really minimal web frameworks so let's walk through that now at the very beginning we need our little shebang um for user bin we're going to give it the path to our pearl executable and now we need to import the mojolicious light version there is a bigger version of mojolicious i gather that is a little bit more feature full featured but we're just going to start with uh the light version and then we do dash signatures and to be honest i don't know what signatures does but this is kind of how we set up the basic app that should be capital l and then we need to set app secrets to some big random string and in order to get a big random string i think we can do let's see let's do uh let's just run pry we'll find it in ruby because that's the one i'm uh so use uh require secure random and then secure random random.hex and we'll just copy that string that'll give us a random string so then i'm going to put that in here that was using ruby i know there's probably a way to do it in perl but i'm not familiar then we call app start and that should us fire up our application and at this point we don't have any routes so we don't actually know how to respond when a requests come when a request comes in so let's just add a simple like get route that will run this function when we receive a get request for the root route and maybe we just say like uh let's see see render text and i think we can say like hello world and that should be rendered back i believe let's let's give this a whirl so the first thing we need to do is say mod oh actually we need to use cpan m to install mojolicious uh light oops light so cpan m um is like the package manager it's kind of like node or i'm sorry like npm or like um bundler or maven or gradle or all of these things that help you install dependencies cpan m is the the pearl version of that so we say cpan m and then the name of the package we want to install i already have it installed so that's up to date and now i should be able to schmod plus x to make my server.pl executable and now i should be able to run server.pl and uh c requires an explicit package name did you forget to name my c okay oh this should be um an equal sign all right try this again oh and then we want to run um damon to start up the daemon and have it start listening for requests all right so now we've got a server up and running it's listening on our local host at port 3000 i'm going to give us a split pane here and make a curl request to get localhost 3000 and we got back hello world so awesome we have a web server that's running and responding to requests uh cool so let's let's make it even more interesting so server dot pl it turns out this mojolicious thing will serve static assets for you if you make a public directory and in the public directory we'll add uh index.html this will be just like our our sort of landing page here uh oh item is great you can just resize it just like that so i'm gonna fire up some html and say like accept a payment and here we're gonna have some html for accepting a payment we're probably going to have just a form that yeah okay so we're going to have a form with an id of payment form and when this is submitted we're actually going to handle it with javascript because we want to tokenize the card details so we're going to get a give it a div with the id card element and inside of this div this is where we're going to put the we're going to mount the card element here uh okay and then we'll need a button and our button will just say pay and when we click the button that will submit the form and um let's see okay so when we click the button that will submit the form which will tokenize the payment details and create or confirm a payment intent so with stripe we need to if we're going to interact with stripe js which is one of the client libraries for making front end calls uh we need to install stripe.js and we do so like this we want to always install it from js.stripe.com and let's also add a script tag here for just card.js and this will be our our front-end javascript for actually like handling the payment so we'll add card.js here and then like document dot add event listener okay so we've got our we've got our event listener for when the all of the document is ready or all the the document is completed loading and we're going to need to initialize an instance of stripe we're going to pass in our publishable key here you can find your publishable key in the in the stripe dashboard next we want to fire up some elements so this creates a new instance of elements we want a card element we're going to mount that card element back to that card element div that we showed earlier and then next what we want to do is handle that form submission so we want to grab reference to that form and we're going to pass in payment form that's like the the id of the payment form and then we want to say form dot add event listener submit so when this form is submitted we want to handle that event like so we're going to prevent default so that the form isn't submitted to our backend and then we want to create create a payment intent on the server and then we want to confirm the payment intent with the card details okay so the first step here is to create a payment intent on the server so we're going to make a an ajax call where we're going to pass um let's see we need to make an ajax call here so hp we're going to make a post request to create payment intent so it's a route that we're gonna add to the server and maybe here we might pass in some items we might pass in you know like uh maybe we have some cart that has like id one and title is like i don't know shirt or something right so you could you could imagine passing in some cart information from the front end that allows you to calculate how much you're going to collect from this user on the back end when we get the response back from the customer we want to store off that client secret so i'm actually going to simplify this to then just like convert this back to json the same as we had on this line but then i'm just going to delete all these so that we can use destructuring we can say const payment or i'm sorry client secret is equal to await so we're going to await that fetch call when it responds with a client secret then we'll have reference to the client secret and then below we can confirm that client secret by saying cons like error or payment intent is equal to await stripe dot confirm card payment and the first argument is that client secret and the second argument is a payment or is like an options hash where we have to specify the payment method and in in this case it's gonna be a card and we pass in for the card the value of the card here we're going to pass the whole card element which again we created up here so this is when we created a stripe element that's going to be mounted into that card element view we could also pass like billing details details with maybe like the name of the customer so you can say like name or address or other other things here uh we'll just put in like the placeholder like jennyperl okay so then we can just like let's just alert the payment intent dot status um i guess if there's an error we want to like alert error.message and we'll just keep it super simple um okay so this is our this is our entire front end right so we're uh initializing stripe then we're initializing elements uh and mounting and then we're handling the form submission and uh so then we're yep we're creating a payment intent on the server with all of the options that we want to pass in and configure what the customer is purchasing then we're going to confirm the payment intent on the client with those card details and then if there's any error we're going to we're going to alert the error and otherwise we're just going to alert the status ideally that ends up being success okay so we we've done a ton on the we've done a ton on the front end let's go back to the server and we need to add a route here it's going to be a post route so we're going to say post to slash create payment intent so this is going to be another request but instead of rendering back text we're going to render back json and the json we're going to render back is related to the payment uh intent and its client secret so we can get that payment intent by making an api call to stripe so in order to make the api call to stripe we're going to like uh like create payment intent using stripe perl okay so in order to install stripe pearl we need to go back to the command line um what do we accept a payment perl and we want to say cpan m stripe colon colon net or no i'm sorry net colon colon stripe this is the library this is like the stripe pearl library so this is how we install it cpan m net colon colon stripe you might also need to install this cpan m lwp protocol https i ran into this issue where i had to to install that also so a couple things you might need to install to get stripe installed now once we have stripe our net stripe or stripe pearl whatever you want to call it installed we can say use net colon colon stripe here and that will allow us to interact with the stripe api using stripe pearl so the first thing we do is we create a new instance of the the client library and call it stripe this is like a new instance of the stripe client net stripe new we're going to pass in our api key now here you might you might fill this in from environment variables or from other things i'm just going to put it right here you know how to handle your api keys securely or you there's tons of documentation on the web you don't want to directly add this api key and hard code it because you don't want it to show up in any version control or git repositories or anything like that you should treat it as if it were a secret into your stripe account so people can process payment with this etc etc this is a test key so it's not as sensitive but please do take care to protect those api keys i'm going to go roll this right after right after we record so okay so now we have a client a stripe client now we need to figure out how to make a payment intent so we're going to say my payment intent is equal to stripe create payment intent and then we're going to pass in all of the parameters and arguments that we want to use to configure our payment intent there's tons that are available so if you go over to thestripe.com api that's the full api reference um let's see let's add some comment here come go to the let's uh stripe.com docs slash api uh for all supported params i don't know if uh stripe perl is going to keep up with every single supported program because it is a community library but at a minimum you'll want to pass amount and for today we'll just say we're going to charge 19.99 for these shirts and then a currency and you can pass really any supported currency here i'm going to keep it easy and just use usd again you could also use the request that's coming in remember that we're passing in some list of items so you could pull that off of the the context and then calculate the amount we're just hard coding the amount and again these are going to be an integer in cents that you want to charge so this is for 19.99 usd we pass it as an integer in the lowest possible denomination in this case since and so now we have an instance of a payment intent returned from the payment intent create payment intent call which is this is actually making the api call to stripe to create the payment intent and then we're going to store i'm sorry we're going to render back the client secret so let's uh let's give this a whirl so we can say let's see server.pl daymin to start up the server and then here in the terminal i can say curl dash x post http colon slash localhost 3000 slash create payment intent we expect to get back some json with the client secret and we did but it's not it's not nested within any object type it's just like the raw string for the client secret so let's let's clean that up so this should be the json for the client secret and it's actually going to be like uh client secret and that that points at this other thing so we want to wrap this in a hash or i'm not actually sure what you call this in perl but probably hash or hash map or something similar and when you pass it to render json it should know how to fire that up so let's run that again we're going to make the same request and awesome we got back our json that has the client secret and this is the the id or the i'm sorry it has the id and then the secret for that payment intent this is what we need on the front end in order to confirm the payment intent and handle any secure customer authentication or sca or 3ds or whatever so let's go back to the client localhost 3000 so we're getting back hello world not our not our html so let's go update that so we're going to kill the server and then instead of just rendering back text when we get um this root route what we want to do is reply with some static with some static assets so we're going to reply static and we pass in index.html and again it's going to find this index.html file in the public directory and it knows that because it's a static asset and we'll restart our server okay server's fired up i'm listening for requests at port 3000 we've got a pay button but not much else so let's refresh the page here and see what kind of errors we've got um inner html no okay so we've got localhost headers um did we name our element incorrectly or some such okay so card dash element that should have been mounted and i'm guessing that it just doesn't have any are we loading stripe the card did the card script get loaded oh we didn't restart the server okay fire up the server refresh the page and what is happening here are we actually fetching card js um we've fetched localhost um [Music] i'm not seeing card.js being fetched and that's how we're mounting elements so i'm wondering if this is not working let's try making it not a relative path but just making it an absolute path there and then restart in our server refresh okay so now let's see sources no it is still not loading that okay so let's test this out from the terminal make a curl request to slash car.js it's not a post it's a get okay so we're able to pull it from um yeah so what is going on here let's see so card js oh scr that's not right okay all right all right so i misspelled source uh and you might have seen that a long time ago that's okay um all right cool restart the server yeah if the if the javascript isn't loaded then it's not going to work right okay cool so now we have uh we have a card input element there so we can enter in some card details 424242 and then we can click pay and look at that we got succeeded back so that is a successful payment intent we can refresh the page and then enter in one of the test card numbers so this is a a test credit card or the 4242 is a test card number but this one is also a test card number that'll allow us to test secure customer authentication so when we click pay you'll see what it looks like for the authentication model to open um and in practice this page will be populated by the customer's bank and then they would have to enter in like some one-time token or log in or somehow authenticate to the bank and in test mode we just simulate that authentication by clicking the button there so we see that that succeeded um if for some reason the the card number uh was off by one so maybe like we have four two four two four two one four one oh does it have to end maybe this is [Music] uh let me see so in the striped documentation stripe.com docs slash testing there's a ton of test card numbers so let's see uh a failure case okay so this should be declined with a expired card so if we pass in these details and we click pay then we see your card has expired so that is that is the correctly handling the error case so we are looking good we're looking really really good that's all i really really want to show was how to collect a one-time payment with uh with stripe pearl hopefully that's helpful and yeah we'll see you next time

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