Implementing Callbacks

Handle SDK events correctly

The Reach SDK requires callback handlers to manage authentication and tenant events.

Required Callbacks

onReauthRequested Callback

The onReauthRequested callback is triggered when the authentication token expires or becomes invalid. Your implementation should:

1. Fetch a new token from your server
2. Return the new token to update the SDK

const handleReauth = async () => {
  try {
    // Fetch a new auth token from your server
    const response = await fetch('/reach-authtoken');
    const data = await response.json();

    if (!data.success) {
      throw new Error('Failed to get new token');
    }

    // Return the new token
    return data.token;
  } catch (error) {
    console.error('Authentication failed:', error);
    // Handle error appropriately in your UI
  }
};

The SDK will use the returned token to automatically update its authentication state. You do not need to manually dispose and reinitialize the SDK.