Step One: Register your sandbox:
Use this link and enter the following details:
Integration Name (name of the product being connected to Lever)
Descriptions of your integration (must be between 20 and 140 characters)
Callback URI (ensure your callback URI is set to https://app.merge.dev/oauth/callback)
Square Logo (must be a link)
Required Scopes (maximum of 20 scopes)
Step Two: Enter your Lever Credentials in Merge
Navigate to to Intergrations (Left sidebar) then to ATS
Check the Lever Partner Box
Then enter your Oauth Client ID, Oauth Client Secret, and Redirect URI
Redirect URI: https://app.merge.dev/oauth/callback
Step Three: Add Test Linked Account
Navigate to Linked Accounts, click on Test Linked account, click on Launch Test Link
Select the "I want to authenticate through Lever's Website"
Select Lever Sandbox
This should open another window:
Accept, and proceed with the rest of the linking flow