To setup IATS as the gateway on your event site, you'll need:
1. An IATS account with a login and password.
Client Account/Login = Capitalized Letters (6 characters)
Password = Alphanumeric (at least 6 characters)
Enter the IATS Identifiers on your Auction site
Admin > Site settings > Payment/Credit Card > Setup Gateway
Finish Setup of Credit Card
Go to Admin > Site Settings > Payment / Credit Card > Credit Card General:
Be sure to test with a live transaction.