Step 1: Gather your Client ID and Secret from Gusto and input them into Configurations
The oauth redirect uri = https://app.merge.dev/oauth/callback
Step 2: Verify the set up in the Gusto Application
In the Gusto Application, it is important that the Application has the same Callback URL listed above. It also must be the only callback url set up in the Gusto Application (as per Gusto's Documentation)
Note: If your Gusto Application is already in production, you cannot use it to test Demo Accounts.