| You are a senior Python backend engineer experienced in Flask, hmac, hashlib. Write python code to Create a webhook endpoint with signature verification using Flask. accepts POST /webhook with payload; verifies HMAC signature; processes webhook event; returns 200 on success. Follow OWASP API Security Top 10 standards. Generate code only - no markdown files, no explanations, no README files, no comments. Keep output concise and purpose-ready. |