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How to confirm billing of a monthly subscription in PayPal API via webhook?

I am trying to implement a PayPal subscription flow where user click on a PayPal subscription button that I have created via the dashboard.
In the back-end, I listen to the PAYMENT.SALE.COMPLETED webhook that is triggered when a subscription billing is successful. Unfortunately the webhook doesn't send me much infos so that I can retrieve the user and item in my DB linked to the just billed subscription.
This would allow me to securely show private content to that user.
Here is the webhook content sent by payPal (sorry for the length):
const response = {
id: 'WH-4W487015EX264720U-32N35125TV248784B',
event_version: '1.0',
create_time: '2021-04-26T08:24:41.436Z',
resource_type: 'sale',
event_type: 'PAYMENT.SALE.COMPLETED',
summary: 'Payment completed for EUR 6.9 EUR',
resource: {
billing_agreement_id: 'I-T2HP99MJTS1T',
amount: {
total: '6.90',
currency: 'EUR',
details: {
subtotal: '6.90'
}
},
payment_mode: 'INSTANT_TRANSFER',
update_time: '2021-04-26T08:23:59Z',
create_time: '2021-04-26T08:23:59Z',
protection_eligibility_type: 'ITEM_NOT_RECEIVED_ELIGIBLE,UNAUTHORIZED_PAYMENT_ELIGIBLE',
transaction_fee: {
currency: 'EUR',
value: '0.48'
},
protection_eligibility: 'ELIGIBLE',
links: [
{
method: 'GET',
rel: 'self',
href: 'https://api.sandbox.paypal.com/v1/payments/sale/6R7481343K8159132'
},
{
method: 'POST',
rel: 'refund',
href: 'https://api.sandbox.paypal.com/v1/payments/sale/6R7481343K8159132/refund'
}
],
id: '6R7481343K8159132',
state: 'completed',
invoice_number: ''
},
links: [
{
href: 'https://api.sandbox.paypal.com/v1/notifications/webhooks-events/WH-4W487015EX264720U-32N35125TV248784B',
rel: 'self',
method: 'GET'
},
{
href: 'https://api.sandbox.paypal.com/v1/notifications/webhooks-events/WH-4W487015EX264720U-32N35125TV248784B/resend',
rel: 'resend',
method: 'POST'
}
],
}
I have tried to GET the /v1/payments/sale/:id but it didn't bring me much informations.
I have also checked other stack overflow threads on the subject but it wasn't of any help.
I also don't want to use success callbacks provided in the front-end SDK because they are not as secure as a webhook (connection can close before triggering the callback see this gitlab issue)
How can I be aware that a user was billed for his subscription ?

We finally found a workaround to make our back-end retrieve the buyer and the item.
Front-end
On the subscription button code, we noticed after a lot of trial/errors that the createSubscription method accept promises and that we could use it to send the subscriptionId the the back-end before the payment continues:
paypal.Buttons({
style: {...},
createSubscription: function (data, actions) {
return actions.subscription.create({
/* Creates the subscription */
plan_id: 'P-26J60279VA924454WMCBPBSA',
}).then(subscriptionId => { // subscriptionId == I-9DH5L3A3JAEB
return new Promise((res, rej) => {
// here we send the subscriptionId to the back-end
// and create a pending subscription
const body = {subscriptionId, userId, itemId};
apiCall('POST', '/subscription', body,() => {
// allow to return subscriptionId to paypal
resolve(subscriptionId);
})
});
});
},
onApprove: function (data, actions) {
// this function was of NO USE
// it is not safe to call your backend here
// as connexion can close and paypal doesn't
// wait after this function to capture payment
// thus leading to orphaned subscriptions
// (paid but not linked to your backend)
},
}).render('#paypal-button');
Back-end (webhook handler)
The back-end wait for the confirmation webhook where webhookResponse.resource.billing_agreement_id is the subscription id and allow to validate the previously created subscription. I don't exactly understand why billing_agreement_id is not named subscrition_id...
Let me know if it's not clear enougth. I let that as an answer until there is a better way to do it :)

This is my approach to create and verified Paypal subscription payment.
Firstly follow the Integrate Subscriptions steps from Paypal Developer site.
Client Side
html
<script src="https://www.paypal.com/sdk/js?client-id=<YOUR CLIENT ID>&vault=true&intent=subscription"></script>
<div id="paypal-button-container"></div>
You can get data from PayPal using the following snippet:
Javascript
paypal.Buttons({
createSubscription: function( data, actions ) {
return actions.subscription.create({
'plan_id': '<YOUR SUBSCRIPTION PLAN>' // Creates the subscription
});
},
onApprove: function( data, actions ) {
finalize( data, actions );
}
}).render( '#paypal-button-container' ); // Renders the PayPal button
const finalize = async ( data, actions ) => {
const rawResponse = await fetch( '/api/paypal-subscription.php', {
method: 'POST',
headers: {
'Accept': 'application/json',
'Content-Type': 'application/json'
},
body: JSON.stringify({ data: data, actions: actions })
});
const results = await rawResponse.json();
if ( results.error == 0 ){
console.log( "payment created" );
} else {
console.log( 'Errore creazione agenzia' );
};
};
When the subscription is confirmed an onApprove event is fired. Inside the function you can call another function to finalize the subscription process. The function have two object: data and action.
In data object you have a subscriptionID that refers to the unique id of the subscription. You must save this id with the subscription buyer linked to it ( eg: save to database by calling a php file on server using ajax ) .
Server Side Webhooks
In the server side you can get data from PayPal. You have to setup a webhooks call in the developer dashboard for the following action (you can select more or all event if you need ).
BILLING.SUBSCRIPTION.CREATED, BILLING.SUBSCRIPTION.ACTIVATED and for the recurring payment made PAYMENT.SALE.COMPLETED.
<?php
$data = json_decode( file_get_contents( "php://input" ), true );
$data = $data['resource'];
if ( !array_key_exists( 'billing_agreement_id', $data ) ) {
// Not a payment for a billing agreement
// handle single payments or:
die();
};
?>
Keep in mind that: the webhooks simulator doesn't populate the billing_agreement_id, the key that carry the subscriptioID, referred as id in the other Webhooks calls. I suggest to create in the sandbox a subscription with a daily FREQUENCY with one (1) day interval. With this subscription the PAYMENT.SALE.COMPLETED will be fired immediately. The key to find in PAYMENT.SALE.COMPLETED call is billing_agreement_id.
Verify Paypal webhook notification
You also have to verify the authenticity of the notification:
<php
// get request headers
$headers = apache_request_headers();
// get http payload
$body = file_get_contents( 'php://input' );
// compose signature string: The third part is the ID of the webhook ITSELF(!),
// NOT the ID of the webhook event sent. You find the ID of the webhook
// in Paypal's developer backend where you have created the webhook
$data =
$headers['Paypal-Transmission-Id'] . '|' .
$headers['Paypal-Transmission-Time'] . '|' .
'<WEBHOOK ID FROM THE DEVELOPER DASHBOARD>' . '|' . crc32( $body );
// load certificate and extract public key
$pubKey = openssl_pkey_get_public( file_get_contents( $headers['Paypal-Cert-Url'] ) );
$key = openssl_pkey_get_details( $pubKey )['key'];
// verify data against provided signature
$result = openssl_verify(
$data,
base64_decode( $headers['Paypal-Transmission-Sig'] ),
$key, 'sha256WithRSAEncryption'
);
if ( $result == 1 ) {
// webhook notification is verified
} elseif ( $result == 0 ) {
// webhook notification is NOT verified
} else {
// there was an error verifying this
};
?>
The transmission id, the transmission date, the webhook id and a CRC over the HTTP body. The first two can be found in the header of the request, the webhook id in the developer backend (of course, that id will never change), the CRC is calculated like shown below.
The certificate's location is in the header, too, so we load it and extract the private key.
Last thing to watch out for: The name of the algorithm provided by Paypal (again in a header field) is not exactly the same as understood by PHP. Paypal calls it "sha256WithRSA" but openssl_verify will expect "sha256WithRSAEncryption". You can read more about verification precess here

ERROR with Stripe Checkout: One-Time + Subscription Payment Buttons on the same page?

UPDATED I built a pricing page that uses Stripe Checkout to use both a One-Time payment button for product 1 and a Subscription payment button for product 2.
My goal is to redirect the one time payment button to Stripe Checkout with a one time payment, and separately redirect the subscription payment to a checkout with a recurring payment.
According to STRIPE this can be done using Subscription as the Mode in the CheckoutSession in create-checkout-session.php (sample project) :
The mode of the Checkout Session. Required when using prices or setup
mode. Pass subscription if the Checkout Session includes at least one
recurring item.
Contrary to the Stripe Docs the following line of code: 'mode' => 'subscription', activates subscription payments ONLY, but it doesnt redirect one time payments. For one-time payments to work I must change it to: 'mode' => 'payment', but then subscription payments don't work.
Here's the php code in question:
<?php
require_once 'shared.php';
$domain_url = $config['domain'];
// Create new Checkout Session for the order
// Other optional params include:
// [billing_address_collection] - to display billing address details on the page
// [customer] - if you have an existing Stripe Customer ID
// [payment_intent_data] - lets capture the payment later
// [customer_email] - lets you prefill the email input in the form
// For full details see https://stripe.com/docs/api/checkout/sessions/create
// ?session_id={CHECKOUT_SESSION_ID} means the redirect will have the session ID set as a query param
$checkout_session = \Stripe\Checkout\Session::create([
'success_url' => $domain_url . '/success.html?session_id={CHECKOUT_SESSION_ID}',
'cancel_url' => $domain_url . '/canceled.html',
'payment_method_types' => ['card'],
'mode' => 'subscription',
'line_items' => [[
'price' => $body->priceId,
'quantity' => 1,
]]
]);
echo json_encode(['sessionId' => $checkout_session['id']]);
And here's the javascript code:
// Create a Checkout Session with the selected plan ID
var createCheckoutSession = function(priceId) {
return fetch("./create-checkout-session.php", {
method: "POST",
headers: {
"Content-Type": "application/json"
},
body: JSON.stringify({
priceId: priceId
})
}).then(function(result) {
return result.json();
});
};
// Handle any errors returned from Checkout
var handleResult = function(result) {
if (result.error) {
var displayError = document.getElementById("error-message");
displayError.textContent = result.error.message;
}
};
/* Get your Stripe publishable key to initialize Stripe.js */
fetch("./config.php")
.then(function(result) {
return result.json();
})
.then(function(json) {
var publishableKey = json.publishableKey;
var subscriptionPriceId = json.subscriptionPrice;
var onetimePriceId = json.onetimePrice;
var stripe = Stripe(publishableKey);
// Setup event handler to create a Checkout Session when button is clicked
document
.getElementById("subscription-btn")
.addEventListener("click", function(evt) {
createCheckoutSession(subscriptionPriceId).then(function(data) {
// Call Stripe.js method to redirect to the new Checkout page
stripe
.redirectToCheckout({
sessionId: data.sessionId
})
.then(handleResult);
});
});
// Setup event handler to create a Checkout Session when button is clicked
document
.getElementById("onetime-btn")
.addEventListener("click", function(evt) {
createCheckoutSession(onetimePriceId).then(function(data) {
// Call Stripe.js method to redirect to the new Checkout page
stripe
.redirectToCheckout({
sessionId: data.sessionId
})
.then(handleResult);
});
});
});
Is it even possible to have both one time payments and recurring payments on the same page with Stripe Checkout? How can I accomplish this?
Update according to Bemn:
$checkout_session = \Stripe\Checkout\Session::create([
'success_url' => $domain_url . '/success.html?session_id={CHECKOUT_SESSION_ID}',
'cancel_url' => $domain_url . '/canceled.html',
'payment_method_types' => ['card'],
'mode' => $body->mode
'line_items' => [[
'price' => $body->price_xxx,
// For metered billing, do not pass quantity
'quantity' => 1,
]],
'line_items' => [[
'price' => $body->price_zzz,
// For metered billing, do not pass quantity
'quantity' => 1,
]]
]);
echo json_encode(['sessionId' => $checkout_session['id']]);
And the JS:
// Create a Checkout Session with the selected plan ID
var createCheckoutSession = function(priceId, mode) {
return fetch("./create-checkout-session.php", {
method: "POST",
headers: {
"Content-Type": "application/json"
},
body: JSON.stringify({
priceId: priceId,
mode: mode // <-- passing the mode, e.g. 'payment' or 'subscription'
})
}).then(function(result) {
return result.json();
});
};
And the HTML:
<div data-stripe-priceid="pricexxx" data-stripe-mode="payment" id="onetime-btn" class="bold mt-2 d-inline-block w-100-after-md max-width-xxs py-2 btn btn-secondary">Ore Time</div>
<div data-stripe-priceid="pricexxx" data-stripe-mode="subscription" id="subscription-btn" class="bold mt-2 d-inline-block w-100-after-md max-width-xxs py-2 btn btn-secondary">Ore Time</div>

Is it even possible to have both one time payments and recurring payments on the same page with Stripe Checkout?
Yes. The key is you should pass the correct options to generate the corresponding Stripe Checkout session ID.
How can I accomplish this?
Backend: Have a function to accept Stripe's price ID and payment mode as input and return a Stripe Checkout session ID as the output.
Frontend: Pass payment mode information to /create-checkout-session.php. (see the Note if you are unable to do so)
Details
The following solution assuming that:
You generate a Stripe Checkout Session ID at the backend. That ID will then pass to .createCheckoutSession() in js frontend.
You have a 1-time product (let's call it PAY) and a recurrent subscription (let's call it SUB).
Frontend
I think you are close. What you need to do is passing the mode information to your API endpoint as well:
// Create a Checkout Session with the selected plan ID
var createCheckoutSession = function(priceId, mode) { // <-- add a mode parameter
return fetch("./create-checkout-session.php", {
method: "POST",
headers: {
"Content-Type": "application/json"
},
body: JSON.stringify({
priceId: priceId,
mode: mode // <-- passing the mode, e.g. 'payment' or 'subscription'
})
}).then(function(result) {
return result.json();
});
};
If so, each checkout button in the page should have corresponding info of the priceId and payment mode. You can do so by storing them using data attribute:
<div data-stripe-priceid="price_yyy" data-stripe-mode="subscription">Recurrent</div>
<div data-stripe-priceid="price_zzz" data-stripe-mode="payment">1-time</div>
If so, you can get the data attributes by e.g. a click event.
Note: If you cannot add an extra param to indicate mode, you neeed to identify if the given price ID is a 1-time or recurrent product in the backend. See https://stripe.com/docs/api/prices/object?lang=php#price_object-type for more details.
Backend
Here are 2 sample code snippets from Stripe's documentation. Direct copying of them does not work.
Reference for PAY: https://stripe.com/docs/checkout/integration-builder
$checkout_session = \Stripe\Checkout\Session::create([
'payment_method_types' => ['card'],
'line_items' => [[
'price_data' => [
'currency' => 'usd',
'unit_amount' => 2000,
'product_data' => [
'name' => 'Stubborn Attachments',
'images' => ["https://i.imgur.com/EHyR2nP.png"],
],
],
'quantity' => 1,
]],
'mode' => 'payment',
'success_url' => $YOUR_DOMAIN . '/success.html',
'cancel_url' => $YOUR_DOMAIN . '/cancel.html',
]);
In your case, you may not need to define 'price_data'. Instead, you should use 'price', like the next example.
Reference for SUB: https://stripe.com/docs/billing/subscriptions/checkout#create-session
$checkout_session = \Stripe\Checkout\Session::create([
'success_url' => 'https://example.com/success.html?session_id={CHECKOUT_SESSION_ID}',
'cancel_url' => 'https://example.com/canceled.html',
'payment_method_types' => ['card'],
'mode' => 'subscription',
'line_items' => [[
'price' => $body->priceId,
// For metered billing, do not pass quantity
'quantity' => 1,
]],
]);
Take a look at this reference: https://stripe.com/docs/api/checkout/sessions/create. For line_items, you can just simply using 'price' and pass the price ID (e.g. price_xxx), which means your 'line_items' will looks like this:
'line_items' => [[
'price' => $body->priceId,
'quantity' => 1,
]],
For 'mode', use the value from your API request. It should be something like:
'mode' => $body->mode
Which means in your backend you better define a function (e.g. generate_checkout_session) to:
parse the json body received in the API request
get priceId and mode from the parsed data
use the priceId and mode in \Stripe\Checkout\Session::create and
returns the checkout_session ID
Hope this (and the reference urls) can help you.

When you create your Session you can pass both a Price for the recurring amount charged on the subscription and another Price for the one-time fee you want to charge. You can combine multiple recurring Prices and one-time Prices overall.
$checkout_session = \Stripe\Checkout\Session::create([
'success_url' => $domain_url . '/success.html?session_id={CHECKOUT_SESSION_ID}',
'cancel_url' => $domain_url . '/canceled.html',
'payment_method_types' => ['card'],
'mode' => 'subscription',
'line_items' => [
// Add a one-time Price for $10
[
'price' => 'price_123',
'quantity' => 1,
],
// Add another one-time Price for $23
[
'price' => 'price_345',
'quantity' => 1,
],
// Add a recurring Price for $100 monthly
[
'price' => 'price_ABC',
'quantity' => 1,
],
]);
The code above will create a session with 3 line items. One for $100 monthly, one for $10 just once and one for $23 just once. The total for the session would be $133 on the first payment. It will also start a subscription for $100 a month and future invoices will be for $100 as expected.

What I have got is that you just need to add a check for either it is one-time or subscription here is what you can do:
JS FILE CHANGES:
var createCheckoutSession = function(priceId, $mode) {
return fetch("./create-checkout-session.php", {
method: "POST",
headers: {
"Content-Type": "application/json"
},
body: JSON.stringify({
priceId: priceId,
paymentType: $mode, // This vary based on the button clicked either one-time or subscription.
})
}).then(function(result) {
return result.json();
});
};
/* Get your Stripe publishable key to initialize Stripe.js */
fetch("./config.php")
.then(function(result) {
return result.json();
})
.then(function(json) {
var publishableKey = json.publishableKey;
var subscriptionPriceId = json.subscriptionPrice;
var onetimePriceId = json.onetimePrice;
var stripe = Stripe(publishableKey);
// Setup event handler to create a Checkout Session when button is clicked
document
.getElementById("subscription-btn")
.addEventListener("click", function(evt) {
createCheckoutSession(subscriptionPriceId, 'subscription').then(function(data) {
// Call Stripe.js method to redirect to the new Checkout page
stripe
.redirectToCheckout({
sessionId: data.sessionId
})
.then(handleResult);
});
});
// Setup event handler to create a Checkout Session when button is clicked
document
.getElementById("onetime-btn")
.addEventListener("click", function(evt) {
createCheckoutSession(onetimePriceId, 'onetime').then(function(data) {
// Call Stripe.js method to redirect to the new Checkout page
stripe
.redirectToCheckout({
sessionId: data.sessionId
})
.then(handleResult);
});
});
});
Now we need to make changes in PHP file:
PHP FILE CHANGES:
$checkout_session = \Stripe\Checkout\Session::create([
'success_url' => $domain_url . '/success.html?session_id={CHECKOUT_SESSION_ID}',
'cancel_url' => $domain_url . '/canceled.html',
'payment_method_types' => ['card'],
'mode' => $body->paymentType, // Here is what we have got from front-end
'line_items' => [[
'price' => $body->priceId,
'quantity' => 1,
]]
]);

For subscription we actually need to set interval, which is not need to set in one time purses. Probably this error happening for this reason.
Add recurring can be solve recurring error.
recurring: {
interval: 'month' // 'month' | 'year'
}

How to insert data into mysql using angular and nodejs - getting (NULL, NULL) upon insert - Problem solved

Good day,
I've been trying to learn a bit of angular and nodejs. I found a tutorial on a realtime chat app and made some few adjustment to some function of the code. But the one aspect that I cannot seem to get right is the ability for the user to post to a feed. The login process works, the user is already logged in but the user can't post. I would also like to be able to get all they data i insert from all the user to show up like a normal feedview will. Please assist.
Here are my files:
FROM MY CONTROLLER HERE IS THE CODE WHEN THE BUTTON IS PRESSED
$scope.postDatatoDd = () => {
appService.httpCall({
url: '/posts',
params: {
'posts': $scope.data.info,
'from_user_id': $scope.data.username
}
})
.then((response) => {
// $scope.$apply();
})
.catch((error) => {
alert(error.message);
});
}
and here is my route file:
this.app.post('/posts', async(request,response) => {
const reqResponse = {}
const data = {
posts : request.body.postDatatoDd,
from_user_id: request.body.username
};
if (data.posts === ''){
reqResponse.error = true;
reqResponse.message = `error, input`;
response.status(412).json(reqResponse);
} else {
const result = await helper.insertFeed(data);
if (result === null) {
reqResponse.error = true;
reqResponse.message = `they was an error.`;
response.status(417).json(reqResponse);
} else {
reqResponse.error = false;
reqResponse.userId = result.insertId;
reqResponse.message = `posted succesfully`;
response.status(200).json(reqResponse);
}
}});
and in my helper file there is this function to insert data:
async insertFeed(params){
try {
return await this.db.query(
`INSERT INTO posts (from_user_id,posts) values (?,?)`,
[params.from_user_id,params.postDatatoDd]
);
} catch (error) {
console.warn(error);
return null;
}
}
On the client side here is the button with :
<label for="postDatatoDd">Post</label>
<input type="text" id="postDatatoDd"
ng-model="data.postDatatoDd"
class="feed form-control"
placeholder="post your data here?"
/>
<button ng-click="postDatatoDd()" class="btn btn-primary">Post</button>
</div>
--- EDIT 1---
Data is being inserted now, but it is receiving the values as (NULL, NULL).
--- EDIT 2 ---
After closely looking at the code and fixing some naming variables the code works fine, the data is being inserted in mysql as it should.

Other than a lot of typos when it comes to the variables reference. The code seem to be fine.
Assuming that you using appservice class somewhere in your code and its functioned, then everything else will work.
You are getting the (NULL, NULL) because you are parsing parameters that are not being properly parsed out to your helper file, please close attention to that.
appService
.httpCall({
url: "/posts",
params: {
posts: $scope.data.postbuzz,
from_user_id: $scope.data.username,
},
})
.then((response) => {
$scope.$apply();
})
.catch((error) => {
alert(error.message);
});
make sure that the data that you calling from this above function is similar to $scope parameter you passing in your route file that your requesting:
const data = {
posts : request.body.posts,
from_user_id: request.body.from_user_id}
and in your database helper class you running:
`INSERT INTO posts (from_user_id,post) values (?,?)`,
[params.from_user_id,params.posts]
Hope this was helpful
You seem to have an understand already. your question may help a lot more people in the future.

params should be as following, since the data object has properties from_user_id and posts
`INSERT INTO posts (from_user_id,posts) values (?, ?)`,
[params.from_user_id,params.posts]
Might be useful https://www.w3schools.com/nodejs/nodejs_mysql_insert.asp

--- EDIT 2 ---
After closely looking at the code and fixing some naming variables the code works fine, the data is being inserted in mysql as it should.
If you are new to Angular you can use the code as reference.

Page not redirecting after stripe checkout

I'm trying to add a stripe checkout button to my Leadpages landing page and after somebody completes a successful payment they're supposed to be redirected...but that redirect is not happening and I have no idea why.
Here's my page: http://snapstories.leadpages.co/test/... it's using test keys right now so you can test the checkout with Stripe's demo Visa number: 4242424242424242 and any expiry / security code...you'll see that you don't get redirected anywhere.
The demo-stripe.php script is supposed to send a 'success' response to my front-end code which triggers the redirect but that 'success' response is not being sent.
Here's the demo-stripe.php code:
<?php
require_once('./stripe/init.php');
$stripe = array(
"secret_key" => "sk_test_******",
"publishable_key" => "pk_test_******"
);
\Stripe\Stripe::setApiKey($stripe['secret_key']);
// Get the credit card details submitted by the form
$token = $_GET['stripeToken'];
$email = $_GET['stripeEmail'];
$callback = $_GET['callback'];
try {
$customer = \Stripe\Customer::create(array(
"source" => $token,
"email" => $email
));
$charge = \Stripe\Charge::create(array(
'customer' => $customer->id,
'amount' => 100,
'currency' => 'usd'
));
header('Content-type: application/json');
$response_array['status'] = 'success';
echo $callback.'('.json_encode($response_array).')';
return 1;
}
catch ( \Stripe\Error\Card $e) {
// Since it's a decline, \Stripe\Error\Card will be caught
}
?>
Here's the front-end code:
<script src="https://checkout.stripe.com/checkout.js"></script>
<script>
var handler = StripeCheckout.configure({
key: 'pk_test_*****',
image: 'imagefile.png',
locale: 'auto',
token: function(token) {
$.ajax({
type: "POST",
dataType: 'jsonp',
url: "https://snapstories.co/demo-stripe.php",
data: { stripeToken: token.id, stripeEmail: token.email},
success: function(data) {
window.location.href = "http//www.google.com";
},
});
}
});
document.getElementsByClassName('w-f73e4cf1-859d-e3e4-97af-8efccae7644a')[0].addEventListener('click', function(e) {
// Open Checkout with further options:
handler.open({
name: 'Testing',
description: 'testing',
amount: 100
});
e.preventDefault();
});
// Close Checkout on page navigation:
window.addEventListener('popstate', function() {
handler.close();
});
</script>

I'm guessing your front-end code doesn't get to the success function.
Web console returns:
ReferenceError: $ is not defined
It looks like you're using the jQuery command $.ajax(), but I can't see where you've loaded the jQuery library. Try and load it above the script that uses it and see what happens

Be sure to double check the Stripe Checkout requirements. It seems, based on the link you posted, that you're using the HTTP protocol. Stripe Checkout requires you use the HTTPS protocol. That means if you're not using an ssl certificate on your page using Checkout, your page isn't going to return a token nor will it execute any further.

Login with PayPal (PHP) -> 'Credential not found for default user.'

I always get the following error when I want to login with PayPal:
Fatal error: Uncaught exception 'PayPal\Exception\PayPalInvalidCredentialException' with message 'Credential not found for default user. Please make sure your configuration/APIContext has credential information' in /home/.sites/137/site1611/web/Website/PayPal-PHP-SDK/paypal/rest-api-sdk-php/lib/PayPal/Core/PayPalCredentialManager.php:154
I implemented the PayPal PHP SDK correctly and I already created a Sandbox User account in my PayPal developer dashboard. I also retrieve a correct refresh_token and access_token but I'm not able to retrieve the user information like email, name, etc. What am I doing wrong?
My JS on the 'Login with PayPal' page looks like that:
<span id="myContainer" style="position: absolute;top: 0;left: 0;z-index: 1000;"></span>
<script src="https://www.paypalobjects.com/js/external/api.js"></script>
<script>
paypal.use( ["login"], function(login) {
login.render ({
"appid": "ATAoL...nifIi",
"authend": "sandbox",
"scopes": "profile email address https://uri.paypal.com/services/paypalattributes",
"containerid": "myContainer",
"locale": "en-us",
"returnurl": "http://www.url.com/return.php"
});
});
</script>
And my PHP script at the returnurl looks like that:
error_reporting(E_ALL);
require __DIR__ . '/PayPal-PHP-SDK/autoload.php';
use PayPal\Rest\ApiContext;
use PayPal\Api\OpenIdTokeninfo;
use PayPal\Api\OpenIdUserinfo;
use PayPal\Auth\OAuthTokenCredential;
use PayPal\Exception\PayPalConnectionException;
$code = $_GET['code'];
$clientId = 'ATAoLjBG....AbL4vWj89y89nifIi';
$clientSecret = 'EKoaU4uh....YXwCjlCj6FadrRXAdx';
$apiContext = new ApiContext(new OAuthTokenCredential($clientId, $clientSecret));
try {
$accessToken = OpenIdTokeninfo::createFromAuthorizationCode(array('code' => $code), null, null, $apiContext);
}
catch (PayPalConnectionException $ex) {
print_r('###################### Error'); exit(1);
}
print_r('###################### Success: ' . $accessToken);
$user = OpenIdUserinfo::getUserinfo(array('access_token' => $accessToken, $apiContext));
print_r($user);

In your last line, you are passing apicontext inside array by mistake ! Fix that and you should be fine.
You can see the sample code here: http://paypal.github.io/PayPal-PHP-SDK/sample/doc/lipp/GetUserInfo.html
This is how it should be :
$user = OpenIdUserinfo::getUserinfo(array('access_token' => $accessToken), $apiContext);
print_r($user);