I have 2 web sites, one primary and one development. I am trying to configure the development web site to use PayPal Express with PayPal Sandbox, but I can't understand about the API credentials. You cannot download an API certificate from the Sandbox like you can from live PayPal, so what do you put in the field for SSL Certificate? I copied the unsername and password from the PayPal sandbox into the fields for username and password so I think that is ok. I am not sure what I need to put into the SSL Certificate field.
