Passing custom variables to paypal IPN

Question

I am trying to pass custom variables to paypal IPN. I can manage to pass one variable. But i don\'t know how to pass multiple variables.

My Process is something like

Answer 1

A vague memory tells me there are two options for sending data to PayPal. The command x_click and i thought there was something like an upload parameter. When the upload parameter is set to 1 you can send multiple lines to paypal.

Update PayPal information about this