Thanks for this malky66.
Yes, the seller just said that he has changed his "sales settings" and has asked me to try again.
Therefore, you are right that the seller has selected the option for the configuration to accept only the premium payments, linked in the PayPal accounts, etc.
However, I think it was a default selection and that the seller had not realized that he was potentially restricting his sales by requesting payments only through "premium linked accounts in etc.".
I wonder if the sales settings for PayPal are set by default to request these premium accounts and then the sellers have to change those settings to allow payments through a normal account.
Surely it would be better to have the normal process of using PayPal as the default, instead of trying to force the "linked, premium or business account" to the buyers of material here in DP.