Identity Linking

Introduction

Identity Linking is part of the Paycux platform. This page explains what it does, when to reach for it, and the smallest working setup you can ship.

Everything below applies to both environments. Build and test in staging, then promote the same configuration to production without changing your code — only the API key and client ID differ.

Credentials

Credentials is handled by Identity Linking rather than by your application code. Paycux exposes it through the same API surface as the rest of the platform, so the client you already configured needs no additional setup.

Configuration lives in the dashboard and is versioned per environment. Change it in staging, confirm the behaviour, then apply the same change to production.

Email verification

Verify the setup end to end before you hand it to a customer. Run the flow from a private browser window so no existing session masks a broken step.

1. 1Open the connection in the dashboard and confirm its status reads Active.
2. 2Start the flow from your application, not from the provider, so the redirect URI is exercised.
3. 3Sign in as a test user and confirm the profile arrives with an email address.
4. 4Check the connection's event list — a successful sign-in appears within a few seconds.

Domain verification

Domain verification applies specifically to Identity Linking. It behaves the same in both environments, and the values it depends on are visible in the dashboard for the environment you have selected.

If the behaviour you see does not match this description, check which environment your API key belongs to before anything else — a staging key against production data is the most common cause.

SSO identity linking

A user record holds the identity Paycux resolved for the person: email, name, verification state, and the identities they have linked. It is the object your application should key on.

Users are unique by email within a project. When the same person arrives through a second provider, Paycux links the identity to the existing user rather than creating a duplicate.

Directory Sync and SSO linking

Directory Sync keeps your user list in step with the customer's directory. Paycux receives create, update and delete operations and normalizes them into a single shape regardless of the source system.

Deletes arrive as deactivations. Treat a deactivated user as a user who can no longer sign in, and decide separately whether to delete their data.