Looking for the v10 manual? Visit our new user's guide!
Search Descriptions Version
This article applies to: ML8, MultiStore

PayPal Error: PaymentAction of Authorization is not allowed with Unilateral and Non-Credentialed authentication

This error is is encountered after returning to the cart following the PayPal payment entry.

This can be caused by an entry in the AppConfig: PayPal.API.MerchantEMailAddress

BLANK out the value for the AppConfig: PayPal.API.MerchantEMailAddress which was most likely entered in error, where it is confused with the PayPal.BusinessID email value.
This is the field called "API Email (usually blank):" in the admin console Site Configuration Wizard in version 9 software.