Custom WordPress plugin used as an extension of Direct Stripe Plugin

ds-custom-code.php

<?php
/*
 * Plugin Name: DS custom code
 * Author: Nicolas Figueira
 * Description: Direct Stripe custom actions and filters
 * Plugin URI: https://gist.github.com/New0/d72217de1e60871cf938715c2fd03b61
 *
 * This code is an add-on of Direct Stripe WordPress plugin
 */
 
//Add the email receipt parameter to the Stripe user after a successfull charge
function my_direct_stripe_action($chargeID, $post_id, $button_id, $user_id) {
   // Add the action for a precise button setting a button_id
   if( $button_id === '1') {
     // Retrieve the user to identify its email address
     $user = get_user_by( 'ID', $user_id );
     $email_address = $user->user_email;
     //Retrieve Stripe Charge and update it
     $ch = \Stripe\Charge::retrieve($chargeID);
     $ch->receipt_email = $email_address;
     $ch->save();
 }
}
// Pass the function 'my_direct_stripe_action' through the action with priority 10 and 4 parameters
add_action( 'direct_stripe_before_success_redirection', 'my_direct_stripe_action', 10, 4 );