1. Register User
First you need to register user. If you are new user, click :
Register User. If you are existing user, just Login.
2. Get API Key
Once you are logged in with your Email and Password, go to MyAccount. In MyAccount screen, click on "For Developers" menu item as shown in the following screenshot.
And Click "Generate API Key" button.
Once API key is generated it should appear as shown in the following screenshot. You are now all set to make EnrollBusiness API calls. You have to pass this API Key as APIKey header to all API requests.