i want to add payment gateway in my android app

Hello, I am looking for a professional freelancer to help me add multiple payment gateway options into my existing Android app. Specifically, I need someone who knows how to integrate PayPal, Stripe and other payment gateways, accordingly. I would like to have multiple payment gateways supported in my app. That being said, I do not require the integration of any in-app purchases nor subscriptions. If you think you have the experience and know-how to help me with this project, please get in touch. I look forward to hearing from you!