Verify Item Purchases with the Envato API

This article focuses on how to simply and efficiently converse with Envato’s API in order to verify the authors’ customers’ purchase codes in the author’s own applications. I talk through all the steps to set up this function, covering how to create the unique API key required, using the PHP cURL function and interpreting the output.

<?php
    function verify_envato_purchase_code($code_to_verify) {
    // Your Username
    $username = 'USERNAME';
      
    // Set API Key  
    $api_key = 'API KEY';
      
    // Open cURL channel
    $ch = curl_init();
       
    // Set cURL options
    curl_setopt($ch, CURLOPT_URL, "http://marketplace.envato.com/api/edge/". $username ."/". $api_key ."/verify-purchase:". $code_to_verify .".json");
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
       
    // Decode returned JSON
    $output = json_decode(curl_exec($ch), true);
       
    // Close Channel
    curl_close($ch);
       
    // Return output
    return $output;
}
  
$purchase_key = 'PURCHASE KEY TO CHECK';
  
$purchase_data = verify_envato_purchase_code( $purchase_key );
  
if( isset($purchase_data['verify-purchase']['buyer']) ) {
      
    echo '<strong>Valid License Key!</strong><br>Details;<ul>';
    echo '<li>Item ID: ' . $purchase_data['verify-purchase']['item_id'] . '</li>';
    echo '<li>Item Name: ' . $purchase_data['verify-purchase']['item_name'] . '</li>';
    echo '<li>Buyer: ' . $purchase_data['verify-purchase']['buyer'] . '</li>';
    echo '<li>License: ' . $purchase_data['verify-purchase']['licence'] . '</li>';
    echo '<li>Created At: ' . $purchase_data['verify-purchase']['created_at'] . '</li>';
    echo '</ul>'; 
} else {
   echo 'Invalid license key.';
}
?>

Sources:
http://www.wpeka.com/verify-item-purchases-envato.html
http://hbt.io/verify-item-purchases-envato/