Payment gateway with coinbase - php

Question

i have integrated coinbase api in my web app. When charge is created, users are directed to coinbase commerce website to make payment. How do i check if the user has finished paying or not and if the exact amount has been paid. Below is my code
<?php
require_once __DIR__ . "/vendor/autoload.php";
use CoinbaseCommerce\ApiClient;
use CoinbaseCommerce\Resources\Charge;
/**
* Init ApiClient with your Api Key
* Your Api Keys are available in the Coinbase Commerce Dashboard.
* Make sure you don't store your API Key in your source code!
*/
ApiClient::init("MY API KEY HERE");
$chargeObj = new Charge();
$chargeObj->name = 'Bitcoin Deposit';
$chargeObj->description = 'Testing the payment system';
$chargeObj->local_price = [
'amount' => '100.00',
'currency' => 'USD'
];
$chargeObj->pricing_type = 'fixed_price';
try {
$chargeObj->save();
// insert into database with status pending
$queryobject->insertTransaction($_SESSION['user_id'],$chargeObj->id, $amount, $status, $currentTime,
$chargeObj->name, $chargeObj->currency);
} catch (\Exception $exception) {
echo sprintf("Sorry! payment could not be created. Error: %s \n", $exception->getMessage());
}
if ($chargeObj->id) {
$chargeObj->description = "New description";
// Retrieve charge by "id"
try {
$retrievedCharge = Charge::retrieve($chargeObj->id);
$hosted_url = $retrievedCharge->hosted_url;
header('location: '.$hosted_url);
} catch (\Exception $exception) {
echo sprintf("Enable to retrieve charge. Error: %s \n", $exception->getMessage());
}
}

Answer 1

You need to use webhooks for this, you can create an endpoint for this. Unfortunately Coinbase does not have a sandbox environment so you are going to need a bit of cryptocurrency in your account.