NFC Payment Processing on Android & Windows

I'm in need of a professional with expertise in NFC to help me integrate payment processing functionality using NFC technology. Here are some details to help you understand the requirements:
- Primary Purpose: The main goal of this project is to enable NFC for payment processing
- Platform Support: You must be skilled in Android and Windows development, as the final product will need to function seamlessly on these platforms. iOS is not part of this project.
- Payment Gateway: I have not yet decided on the payment gateway to be used, so your advice and input regarding this would also be welcome.

Your role in this project will include:
- Understanding the NFC technology and how it can be used for payment processing
- Developing the application for both Android and Windows platforms
- Advising on the best payment gateway for this specific project

Ideal candidates for this job should have:
- Extensive experience in NFC technology
- Proven track record in payment processing applications
- Proficiency in Android and Windows development
- Good communication skills, as your input will be highly valuable throughout the project.