1. Go to this page and download the library: Download symm/guzzle-bitpay library. Choose the download type require.
2. Extract the ZIP file and open the index.php.
3. Add this code to the index.php.
<?php
require_once('vendor/autoload.php');
/* Start to develop here. Best regards https://php-download.com/ */
symm / guzzle-bitpay example snippets
use Symm\BitpayClient\BitpayClient;
$client = BitpayClient::createTestClient('YOUR_TEST_API_KEY_HERE');