real middleman: BTCPay payment gate + webhook + Printful adapter + checkout redirect

backend/app/main.py

@@ -6,7 +6,7 @@ from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 
 from app.database import Base, engine
-from app.routers import admin, analytics, auth, customers, health, orders, products, suppliers
+from app.routers import admin, analytics, auth, customers, health, orders, products, suppliers, webhooks
 from app.version import VERSION
 
 # Idempotent — schema.sql is canonical and already applied; create_all only
@@ -31,6 +31,7 @@ app.include_router(orders.router, prefix="/api/orders", tags=["orders"])
 app.include_router(customers.router, prefix="/api/customers", tags=["customers"])
 app.include_router(admin.router, prefix="/api/admin", tags=["admin"])
 app.include_router(analytics.router, prefix="/api/analytics", tags=["analytics"])
+app.include_router(webhooks.router, prefix="/api/webhooks", tags=["webhooks"])
 
 
 @app.get("/")