Cashfree Payment Gateway Backend Issue Fix

I'm experiencing a problem with the Cashfree payment gateway integration in my backend API. The issue is a missing signature parameter, which is preventing payments from processing correctly. I need a skilled backend developer with experience in payment gateway integrations to diagnose and fix this issue promptly.

Ideal Skills:
- Extensive experience with backend API development
- Proven track record of working with Cashfree payment gateway
- Strong problem-solving skills
- Ability to work under pressure and meet deadlines