Integrate Bank Qib Payment Gateway

I need an experienced developer to integrate the Bank Qib payment gateway into my mobile app. The app is built for both Android (Java) and iOS (Swift). The integration should include the API backend.

Key Requirements:
- Include support for one-time payments, recurring payments, and refunds processing.
- Utilize the specific documentation and API guide I have for Bank Qib.

Ideal skills for the job include:
- Proficiency in Java and Swift
- Extensive experience in mobile app development
- Prior experience integrating payment gateways
- Familiarity with API backend development
- Ability to work with provided documentation and API guides.