Flutter + Laravel Developer Needed for Chinese Payment Gateway Integration

I have an existing Flutter Android application with a Laravel-based Admin Panel and Backend.

I am looking for an experienced developer to integrate a Chinese Payment Gateway into my existing system.

I will provide the Payment Gateway API documentation, integration code, and all necessary technical details.

Scope of Work
Integrate the Chinese Payment Gateway into my Flutter Android application.
Integrate the payment API into the Laravel backend.
Implement the deposit/payment request system.
Handle payment initiation, verification, and transaction processing.
Manage successful, failed, and pending payment statuses.
Integrate payment callbacks/webhooks in Laravel.
Synchronize payment data between the Flutter app and Laravel Admin Panel.
Display transaction details and payment status in the Admin Panel.
Implement proper security and prevent duplicate transactions.

Test the complete payment flow.
Fix any integration-related bugs.
Provide the updated source code after completion.

Required Skills
Strong experience in Flutter and Dart.
Good knowledge of Laravel and PHP.
Experience with REST API integration.
Previous experience in payment gateway integration.

Knowledge of secure payment verification and webhook handling.
Experience with Chinese payment gateways is preferred.

Important Information
My Flutter application and Laravel Admin Panel are already developed.

I will provide the API documentation and integration code. The developer must review the existing project and API documentation before starting the work.

When Applying, Please Provide
Your experience with Flutter and Laravel.
Previous payment gateway integration projects.

Estimated completion time.
Your total project cost.