Add post route for tokenUrl

src/app/api/demo-payment/route.ts

@@ -71,3 +71,7 @@ export async function GET() {
 		],
 	});
 }
+
+export async function POST(_: Request) {
+	// During installation this path would be used to save app token that later can be used to authenticate requests. For example to manipulate checkout or orders.
+}