Paypal: trying to pass an amount with a Donation button

Question

I have a Donate button set up for the user to enter the donation amount. I am trying to send an amount with the button. I can enter amount=1.00 in the Add Advanced Variables in

Answer 1

Robert's solution is on the right track, however a non-hosted PayPal form will not work without the hidden "business" field (which should have a value of the email address associated with your PayPal account.)

Other fields should be included for thoroughness: