Step 1: Set Up GitHub Enterprise as OAuth Provider
Navigate to the plugin configuration page, click the "Add New Provider" button (located either in the middle or top-right corner), select GitHub Enterprise as the application, and copy the callback URL from the plugin and keep it handy, as you'll need it to configure GitHub Enterprise as the OAuth provider.
Login to GitHub Enterprise : Go to Github Enterprise and login with your account. Click on settings.
Create Organization: Select Organizations from Personal Settings.
Click on New organization and create organization by entering.
1) organization name
2) Billing email
3) choose your plan
4) terms and conditions - enter a business name
click on create organization. And enter the details.
Create OAuth app: Click on Settings. Select your Organization.
Click on Settings.
Scroll down and select OAuth Apps from Developer settings.
Click on Register an application.
Enter app credentials : Enter app name, plugin homepage URL. Copy Callback URL from the plugin and paste it under Authorized callback URL field and click Register application