Go to Admin | Users and click the green Add User button:
Create New User:
Username: Desired username for user (loginId on API requests)
Email: Email address for user (optional)
Access Level: Select 'Api User'
Password: Desired password *Note: The password must not have an "&" sign on it. (password on API requests)
Confirm: Confirm Password
IP Whitelist
For each API user that is created, you will need to whitelist the IP of the server making the API calls to CheckoutChamp.
Alternatively, if you are using AWS you can specify that in the IP Whitelist Table.
If you are using Google Cloud, you can specify GOOGLE.
NOTE: API Users cannot log into the CRM. They can only send API calls to your instance.