TerminalGateway.registerDevice(
  listOf(
    TerminalDevice(TERMINAL_ID_1, TERMINAL_IP_1),
    TerminalDevice(TERMINAL_ID_2, TERMINAL_IP_2)
  )
)

// Registration completed - devices are now available for use
Log.i("TerminalGateway", "Devices registered successfully")

// Set timeout to 5 minutes (default)
TerminalGateway.setOperationTimeout(minutes = 5)

// Set custom timeout for longer operations
TerminalGateway.setOperationTimeout(minutes = 10)

// Set provider-specific timeouts
TerminalGateway.setOperationTimeout(type = TimeoutType.CARD, minutes = 10)
TerminalGateway.setOperationTimeout(type = TimeoutType.QR, minutes = 10)

// Global error monitoring
TerminalGateway.observeError(
  CoroutineScope(Dispatchers.IO)
) { device, error ->
  Log.e("TerminalGateway", "Error on ${device.id}: ${error.message}")
  
  when (error.code) {
    ErrorCode.TERMINAL_BUSY -> {
      // Terminal is processing another transaction
      // Wait and retry later
    }
    ErrorCode.FAILED_TO_CONNECT -> {
      // Network connectivity issue
      // Check network connection and terminal <a href="#finding-terminal-information">IP</a>
    }
    ErrorCode.AUTHENTICATION_FAILED -> {
      // Invalid credentials or <a href="#finding-terminal-information">terminal ID</a>
      // Verify client key and terminal configuration
    }
    // ... handle other error codes
  }
}

// Device-specific error monitoring
val errorFlow = TerminalGateway.errorState(terminalDevice)
val deviceErrorFlow = terminalDevice.error

data class TerminalError(
  val code: ErrorCode,
  val message: String
)

fun handleTerminalError(error: TerminalError?) {
  when (error?.code) {
    ErrorCode.AUTHENTICATION_FAILED -> {
      // Verify API key and <a href="#finding-terminal-information">terminal ID</a>
      Log.e("TerminalGateway", "Authentication failed: ${error.message}")
      // Show user-friendly message and retry with correct credentials
    }
    
    ErrorCode.TERMINAL_BUSY -> {
      // Terminal is processing another transaction
      Log.w("TerminalGateway", "Terminal busy: ${error.message}")
      // Wait and retry after a delay
      retryAfterDelay(5000) // 5 seconds
    }
    
    ErrorCode.FAILED_TO_CONNECT, ErrorCode.NOT_CONNECTED -> {
      // Network connectivity issues
      Log.e("TerminalGateway", "Connection failed: ${error.message}")
      // Check network connection and terminal <a href="#finding-terminal-information">IP address</a>
      checkNetworkConnectivity()
    }
    
    ErrorCode.KEY_INVALID, ErrorCode.INVALID_CREDENTIAL -> {
      // Credential issues
      Log.e("TerminalGateway", "Invalid credentials: ${error.message}")
      // Rotate or refresh API credentials
      refreshCredentials()
    }
    
    ErrorCode.ENCRYPTION_FAILED -> {
      // Encryption key issues
      Log.e("TerminalGateway", "Encryption failed: ${error.message}")
      // Re-initialize SDK with correct encryption keys
      reinitializeSDK()
    }
    
    else -> {
      // Log and escalate unknown errors
      Log.e("TerminalGateway", "Unknown error: ${error?.message}")
      // Report to monitoring system
      reportError(error)
    }
  }
}