I am at my wits end with this.
 
I have Website Payments Pro.
 
I put in the name, password, path to certificate.
 
I know the path is correct, because PayPal Express works.
 
When I try to check out, the error message just says:
 
1002, 2002
 
PayPal says that this is not their error (I don't believe them)
 
But where do I go from here? What is this? How can I fix something if I don't know what it is?
 

screen capture:

Contact the Support.

These are probably the PayPal codes - the numbers relating to the reasons for payment failure.
 
Sometimes you also get a description such as:
 
10544: Transaction cannot be processed. Please use a different payment card.
 
My latest failed order was: 1003, 4762:
 
Viart may explain more - or go to PayPal where they have a list of codes.
 
Chris

Errors like '1002, 2002' could happen if '3D secure checks' activated for your
'PayPal Website Payments Pro' but necessary parameters were wrongly configured.
 
If you don't know how to set it work just edit 'PayPal Website Payments Pro' and change value for parameter 'apply3dsecure' to '0' value.