Set up your integration

if (ContextCompat.checkSelfPermission(getActivity(),
  Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
    String[] permissions = {Manifest.permission.ACCESS_FINE_LOCATION};
    // REQUEST_CODE_LOCATION should be defined on your app level
    ActivityCompat.requestPermissions(getActivity(), permissions, REQUEST_CODE_LOCATION);
}

@Override
public void onRequestPermissionsResult(
  int requestCode,
  @NonNull String[] permissions,
  @NonNull int[] grantResults
) {
  super.onRequestPermissionsResult(requestCode, permissions, grantResults);

  if (requestCode == REQUEST_CODE_LOCATION && grantResults.length > 0
      && grantResults[0] != PackageManager.PERMISSION_GRANTED) {
    throw new RuntimeException("Location services are required in order to " +
                "connect to a reader.");
  }
}

public class TokenProvider implements ConnectionTokenProvider {
  @Override
  public void fetchConnectionToken(ConnectionTokenCallback callback) {
    try {
      // Your backend should call /v1/terminal/connection_tokens and return the
      // JSON response from Stripe. When the request to your backend succeeds,
      // return the `secret` from the response to the SDK.
      callback.onSuccess(secret);
    } catch (Exception e) {
      callback.onFailure(
        new ConnectionTokenException("Failed to fetch connection token", e));
    }
  }
}

// Substitute with your application name, and remember to keep it the same as your AndroidManifest.xml
class StripeTerminalApplication extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        TerminalApplicationDelegate.onCreate(this);
    }
}

// Create your listener object. Override any methods that you want to be notified about
TerminalListener listener = new TerminalListener() {
    @Override
    public void onUnexpectedReaderDisconnect(@NonNull Reader reader) {
        // Handle unexpected disconnects here
    }
};

// Choose the level of messages that should be logged to your console
LogLevel logLevel = LogLevel.VERBOSE;

// Create your token provider.
TokenProvider tokenProvider = new TokenProvider();

// Pass in the current application context, your desired logging level, your token provider, and the listener you created
if (!Terminal.isInitialized()) {
    Terminal.initTerminal(getApplicationContext(), logLevel, tokenProvider, listener);
}

// Since the Terminal is a singleton, you can call getInstance whenever you need it
Terminal.getInstance();