add razorpay integration

Author: ishaanxgupta

src/api/app.py

@@ -30,6 +30,7 @@
 )
 from src.api.routes.api_keys import router as api_keys_router
 from src.api.routes.auth import router as auth_router
+from src.api.routes.billing import router as billing_router
 from src.api.routes.code import router as code_router
 from src.api.routes.enterprise import router as enterprise_router
 from src.api.routes.health import router as health_router
@@ -225,6 +226,7 @@ async def lifespan(app: FastAPI):
     app.include_router(scanner_router)
     app.include_router(auth_router)
     app.include_router(api_keys_router)
+    app.include_router(billing_router)
     app.include_router(enterprise_router)
     app.include_router(telemetry_router)