Payment Deletion. This is only available to use when the 'status' attribute of the payment resource is NOT set to 'Settled'. If so, you must is issue a refund.

deletePayment.php

<?php
 
require 'ConfigFactory.php';
require 'OAuthRequest.php';
 
  $c = new Creds();
  $creds = $c->creds();
  $links = $c->links();
  $accessTokenData = getAccessToken($links, $creds);
  
  $paymentId = "";
  $payment = new OAuthRequest($endpoint['deletePaymentById'], $accessTokenData, null, $paymentId);
  $payment->createHeader();
  echo $payment->sendRequest();
 
?>