Using OAuth Authentication
Use the OAuth authentication standard to connect to Zoho Books. OAuth requires the authenticating user to interact with Zoho Books using the browser.
You will need to register an app to obtain the OAuthClientId, OAuthClientSecret. See Custom Credentials for a procedure.
In the headless OAuth flow, users need to authenticate via a browser on another machine. You need to create a custom OAuth app. See Creating a Custom OAuth App for the procedure.
Creating a Custom OAuth App
You may want to create a custom OAuth app to change the information displayed when users log into the Zoho Books. You can register an app to obtain the OAuthClientId, OAuthClientSecret, and OrganizationId.
See Creating a Custom OAuth App for a procedure.