I have a client with an annual membership service. Sales tax should not be charged on this service, but she has other products (a book) that do need sales tax charged. I have a paypal buy now button set up for the book, but for the membership service I use the gravity form with paypal add on -- http://apluslongevity.com/join-2/ . She does not want it to automatically charge people each year. So we set it up as a product/service instead of a subscription. But when a person from our state buys the service, sales tax is charged. I tried making it a donation instead, but the word "donation" appears in the paypal screens that the end user sees, so that's not going to work. Are there other ways around this?