Overview

Outcome - Understand the different types of Paymob callbacks, their purposes, and HMAC calculation.

Definition

Transaction callbacks are mechanisms used by Paymob to notify your system about payment-related events and transaction statuses. They ensure your platform stays in sync with what happens during and after a customer completes a payment.

When does Paymob send the transaction callback?

Paymob sends the transaction callback only if the transaction succeeds or is declined

Types of Transaction Callbacks

Paymob provides two types of transaction callbacks to keep both your system and your customers informed about payment results:

Transaction Processed Callback

Used to notify your backend system about transaction events and status changes, allowing you to update orders, trigger business logic, and keep your records in sync.

Transaction Response Callback

Used to redirect the customer back to your platform after payment, so you can display the payment result and guide the next user action.

Each callback serves a different purpose and is designed to support both system-level handling and customer-facing communication. Detailed technical implementation for each callback is covered in the following sub-page.

Webhook Testing Tool

We provide a dedicated tool to help you test webhooks. For detailed instructions and usage, please refer to the Webhook Testing Tool page.