PayWhirl Integration for SaaS app

I'm seeking a seasoned developer to integrate PayWhirl into our SaaS app. This is crucial for managing our subscription-based business model.

Key Tasks:
- Implement seamless integration of PayWhirl with our native mobile apps, which are built using .NET MAUI (app) and React (web).
- Set up OAuth for user authentication, ensuring a smooth and secure experience for our existing user base.
- Customize subscription flows to incorporate monthly and yearly plans.

Ideal Skills:
- Proficiency in API integration, specifically with payment gateways and subscription management platforms.
- Experience with .NET MAUI and native mobile app integrations.
- Strong understanding of scalability considerations to accommodate future growth.

Design Requirements:
- All subscription flow pages should adhere to our current app design.

Please provide your relevant experience, an estimated timeline for the project, and your proposed approach to this integration. I look forward to your bids!