v1. Some newer endpoints use v2 — the exact URL is noted in those endpoint references.
Authentication
All API requests use HTTP Basic Authentication. Your Key ID is the username and your Key Secret is the password. See the Authentication page for full details.Rate limits
Razorpay enforces rate limits on API requests. When you exceed the limit, the API returns a429 Too Many Requests response. Implement exponential backoff in your client to retry these requests gracefully.