Develop a payment gateway. This is a development not integration

I am looking for a skilled developer to create a payment gateway from scratch. The development should not involve integration with any existing systems.

Programming Language:
- The preferred programming language for this project is Python.

Functionalities:
- The payment gateway should have basic payment processing capabilities.
- It should also support recurring billing for subscription-based services.
- Additionally, the gateway should be able to process mobile payments.

Timeline:
- There is no specific deadline for the development of the payment gateway.