I just had this email from a person who donated, and I wanted to share what he said about the donation process:
The process was very easy. I sent it via my Canadian PayPal account, not the PayPal.me website. All I did was click on "Send and Request" and when I started to type in your name.... *presto* it found you and the ambulance account right away, so all the other info was not needed in the end. Thought you might like to know this for the next person donating this way.
I hope this helps!