I am trying to set up my fundraising app to work with PayPal sandbox mode. Your instructions do not seem to handle this. Do you have any instructions on the minimal setup so that I can test this app.
As you probably know, the PayPal sandbox site is weird, confusing and obtuse. I am trying to make a decision about using this software but I don't think it is reasonable to proceed without testing it in SandBox mode first. The work (which includes applications to PayPal) is extensive.