The OAuth 2.0 onboarding process is about doing those rules fast and right. It begins with registering your application on the provider’s dashboard. You create a client ID and client secret. These credentials identify your app and give it permission to start the authorization flow.
Next, define your redirect URIs. These are the destinations where the authorization server sends tokens or authorization codes. They must match exactly, or the flow will break. Use HTTPS. Avoid wildcards unless absolutely required.
Choose the right grant type. Authorization Code is the default for server-side apps. Use PKCE (Proof Key for Code Exchange) for public clients or single-page apps. Client Credentials work for service-to-service communication without user involvement.
During onboarding, configure scopes carefully. Scopes decide what access your app gets. Request only what you need. Over-privileged scopes increase risk and may cause provider rejection.
Integrate the authorization endpoint for user login and consent. Capture the authorization code, exchange it at the token endpoint for an access token and, if supported, a refresh token. Always validate tokens before use. Watch expiration times and refresh when necessary.