Payment gateways software

I am looking for a developer to create a payment gateway software for me with the following requirements:

Payment Gateways:
- I want to develop my own payment software

Features:
- Fraud detection
Resellers panel
Admin panel
Refund api
Merchant panel
The all system which I want in automation

Platform:
- Both web and mobile

Ideal skills and experience:
- Experience in payment gateway development
- Proficiency in programming languages such as Java, Python, and Ruby
- Knowledge of fraud detection techniques and best practices for payment security
- Experience working with web and mobile platforms
- Strong problem-solving skills and attention to detail.