Query the gateway or card issuer device list under the specified user account, and return basic device information and online status. Gateway Status Description 0: Offline1: Online Gateway Type Description 00/01: WiFi/4G Gateway 09: Card Issuer (Mandatory field when querying card issuers) Calling Instructions The userId parameter is mandatory. The interface returns devices bound to the corresponding user ID. If the gatewayType parameter is not passed: Return all gateway devices under the user (excluding card issuers). If gatewayType=09 is passed: Return all card issuer devices under the user. Important Notice This is a full gateway query interface. No request parameters passed will return all gateway data in the system database, regardless of user ownership.