Secure Payment via Authorize.Net - not taking Credit card - Says Last Name is Required

Secure Payment via Authorize.Net - not taking Credit card - Says Last Name is Required

Hello,

I am trying to set up Zoho Books so that we can start using it and I am running into the following issue.  I have linked the Books to Authorize.net and when I send a test email to a customer and they click the link to pay it - the "Secure Payment via Authorize.Net" screen does not show Customer Information.  It only asks for Credit Card info and Billing Address.  Therefore Authorize.net is not accepting the payment with an error message that Last Name is missing.

Please advise!!

Thank you!

Jo Englesson