hello
Payment Methods \ Paypal Standard (I've enabled "Paypal Standard" by checking "Active" under Configuration \ Payment \ Payment Methods \ Paypal Standard) - but when user tries to check not appearing in Checkout Payment page for some reason. On cart's Payment page, error message was:

No payment methods available


I've also taken care to:
(a) Remove all credit cards under Configuration \ Payment \ Credit Cards
(b) Remove all other payment methods (under Configuration \ Payment \ Payment Methods), including Manual Processing
(c) No country selected in "Country Restriction List" under Configuration \ Payment \ Payment Methods
(d) User checked out item price NOT zero (one buck USD)

Any suggestion please?

REF:
https://www.nopcommerce.com/boards/t/2064/how-to-paypal-standard-setup.aspx