{"service":"sandbox-payment","version":"0.1.0","public_url":"https://payment-sandbox.smmotion.me","endpoints":{"POST /api/v1/payments/create":"Init payment (HMAC required)","GET  /pay/:id":"User-facing checkout page","POST /pay/:id/process":"Submit checkout decision","POST /api/v1/test/fast-pay":"CI helper: synchronous webhook","GET  /api/v1/payments/:id":"Status check (read-only)"}}