of this market type cannot be processed on this system" or "The market type is invalid"
Error 85: The market type is invalid
Error 87: Transactions of this market type cannot be processed on this system
These errors typically mean your Authorize.Net account is not enabled to handle Card Not Present (CNP) transactions, where the buyer types in their card details, rather than being physically present at the point of sale to have their card swiped. Consult Authorize.Net support if you need further assistance in correcting this issue.