I want a concise, working proof-of-concept that shows how to connect to Egypt’s InstaPay API so I can move funds between bank accounts inside my own app or website. I already have sandbox credentials; what I need is clean, well-commented code—PHP or Node.js is fine, but I’m open to suggestions—that can: • authenticate with the InstaPay API • initiate a payment or transfer • check transaction status • handle and log basic error responses Please keep it lightweight. A simple command-line script, Postman collection, or minimal web page is perfect at this stage; no full UI is required. Include: • source code • a brief README with setup steps and dependencies • quick demo evidence (screenshots or short video) showing successful calls against the sandbox If this initial integration runs smoothly, I’ll consider a follow-up project for a more complete application.