Drupal & Joomla Developer Needed to Integrate Payment Gateway

I am looking for an experienced Drupal & Joomla developer to integrate a payment gateway into my existing Drupal website.

The main work includes:

Integrating a secure payment gateway into the Drupal site

Setting up payment flow for successful and failed transactions

Ensuring the integration follows security best practices

Testing the payment process end to end

Making sure everything works smoothly on desktop and mobile

Requirements:

Strong experience with Drupal

Previous experience integrating payment gateways in Drupal

Knowledge of payment security and best practices

Ability to communicate clearly and provide updates

Please share:

Your experience with Drupal payment integrations

Examples of similar work.

Estimated time to complete the task

This is a straightforward integration task, and I am looking for someone reliable who can complete it efficiently.