The API key, which is created in CCH iFirm, opens the line of communication between the CCH iFirm and ATX applications and enables data to be shared.
To create your API Key for ATX:
CCH iFirm Admin Account
CCH iFirm Security settings
CCH iFirm API Key
Make sure you enter your CCH iFirm address in the CCH iFirm Website Address field. The address is located on your subscription e-mail.