Hello Tamaim
Thanks for writting in regards to my Doris Day font. To answer your question, my fonts are "donationware" and what I normally write is to keep in mind the size of the project and its repercussion. So I don't suggest an amount; it is really up to whatever your heart and pocket feel my font is worth.
A donation should be made through PayPal and my account there is:
turoturom@yahoo.es. Once the donation that is done you are free to use it in anyway you want.
Kind regards
Mario Arturo
P.S. Please, donate in Euros if this happens to be your local currency.