/// Gate.io API Credentials.
///
/// Communication with Gate.io API authenticated endpoints requires
/// valid API credentials. These credentials are used for HMAC SHA-512
/// signing of requests to ensure authenticity.
///
/// Note: Production and testnet API credentials are not interchangeable.
/// Make sure to use the appropriate credentials for your environment.
///
/// [API Documentation](https://www.gate.com/docs/developers/apiv4/#authentication)
///