Replaced the HTTP client code with cURL to handle API requests for the Zibal payment gateway. The change aims to streamline the request process, encapsulating the data and headers setup within the cURL functions.

This change removes the client object and switches to using cURL for handling the payment verification process. The updated implementation uses direct cURL functions to set the request parameters and handle the response, streamlining the verification process. Additionally, the `orderId` variable was removed as it was unused.