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, you can enter AWS, GOOGLE, AZURE, or DIGITAL_OCEAN to whitelist the entire range used by those services
NOTE: API Users cannot log into the CRM. They can only send API calls to your instance.