You need permissions to access the admin section and create OAuth clients
Navigate to Apps and Integrations → APIs → OAuth clients

Click on Add OAuth client and fill out all the details.
Make sure to set the
Client kindto Confidential.
Once you’ve filled out the form. Hit Save to create the OAuth client. You will be shown a secret at the end of the page. It’s only shown once to copy and save it securely in your notes.
Navigate to Integrations, find the Zendesk card, and click on Connect. You will need to enter some of the details from the OAuth app you just configured.

https://**acme**.zendesk.com/admin/home then the subdomain is just acme