feat(payment): configure named gateway providers

packages/payment/src/plugin.ts

@@ -1,6 +1,7 @@
 import { basename, dirname, join } from "node:path";
 import { fileURLToPath } from "node:url";
 import { definePlugin, type PluginContext } from "@wrnexus/plugin";
+import type { PaymentConfig } from "./config.ts";
 
 const root = dirname(dirname(fileURLToPath(import.meta.url)));
 const extension = basename(dirname(fileURLToPath(import.meta.url))) === "dist" ? ".js" : ".ts";
@@ -39,17 +40,23 @@ export function paymentPlugin() {
         : [];
     },
     configure(config, context) {
-      const value = config.payment as
-        { default?: string; gateways?: Record<string, unknown>; sandbox?: boolean } | undefined;
+      const value = config.payment as PaymentConfig | undefined;
       context.metadata.set(key, Boolean(value));
       if (!value) return;
       if (!value.default) throw new Error("WRN-PAYMENT-CONFIG: payment.default is required");
-      if (!value.gateways?.[value.default] && value.default !== "sandbox")
+      const legacySandbox = value.default === "sandbox" && !value.gateways;
+      if (!value.gateways?.[value.default] && !legacySandbox)
         throw new Error(
           `WRN-PAYMENT-CONFIG: default gateway '${value.default}' has no configuration`,
         );
-      if (process.env.NODE_ENV === "production" && value.sandbox)
-        throw new Error("WRN-PAYMENT-CONFIG: sandbox cannot be enabled in production");
+      if (
+        process.env.NODE_ENV === "production" &&
+        (legacySandbox ||
+          Object.values(value.gateways ?? {}).some(
+            (gateway) => gateway && gateway.provider === "sandbox",
+          ))
+      )
+        throw new Error("WRN-PAYMENT-CONFIG: sandbox gateways cannot be enabled in production");
     },
     migrations(context: PluginContext) {
       return context.metadata.get(key)