I, too, am trying to configure PayPal Advanced using CBSubs 3.0, Community Builder 1.9 and Joomla 2.5.9.
When "Payflow Vendor" is left blank I get "Payment basket can not complete" as seen in image pay_1.
When I use my PayPal login email address or Merchant ID, as PayPal says is my vendor id, I get "Error: Invalid Merchant or Merchant doesn't exist" as seen in image pay_2.
I followed the instructions to get the Vendor ID from the tool tip and there isn't a Vendor ID listed with the API Signature as seen in image pay_3.
Is there another source for the Vendor ID? Am I looking in the wrong place?
Thank you for your consideration.
Regards,
Squire