加入了 GVSDSDK 模块，进行了 QModel 兼容层的尝试，生产环境可用

gvsdsdk/payment/gateways/__init__.py

@@ -0,0 +1,15 @@
+"""gvsdsdk.payment.gateways — 支付网关适配器"""
+
+
+def __getattr__(name):
+    if name in ('AbstractPaymentGateway', 'PaymentCredentials'):
+        from gvsdsdk.payment.gateways import base as _m
+        val = getattr(_m, name)
+        globals()[name] = val
+        return val
+    if name in ('GatewayRegistry', 'payment_registry'):
+        from gvsdsdk.payment.gateways import registry as _m
+        val = getattr(_m, name)
+        globals()[name] = val
+        return val
+    raise AttributeError(f"module 'gvsdsdk.payment.gateways' has no attribute {name!r}")