To obtain an OAuthClientId, OAuthClientSecret, and CallbackURL, create an app linked to your Zoho Inventory account.

Create and Configure a Custom OAuth App

Register your application with Zoho's Developer console. You can create an app linked to your Zoho Inventory account as follows:

1. To register your application, go to https://accounts.zoho.com/developerconsole.
2. If this is your first Zoho Inventory OAuth app, click GET STARTED. If you have already made at least one OAuth app, click Add Client ID in the top-right corner of the app list.
3. Select Server-based Applications.
4. Fill the required details in the form.
   • Enter a Client Name for your OAuth app and the Homepage URL for your business.
   • Click the "+" button and enter a callback URL in the Authorized Redirect URIs.
     • If the add-in is running on a web application, set a callback URL that points to the server running the add-in. For example: https://oauth.mysite.com
     • If the add-in is running on desktop or headless machine, set a "localhost:<port>" callback URL that points to an active port on the machine running the add-in. For example: https://localhost:33333
   • Click CREATE.

5. Note the Client ID and Client Secret displayed on the following screen.