I would like to start a website in which users pay for digital content, but 100% of the proceeds will be going to various charities and I would prefer that at no point the money went through me. Is there a charity API which I can integrate into my site to handle payment? Ideally it will have minimum donation amounts and direct back to my site afterwards. It should let me know that the user has paid and give me their email address to send the links to digital downloads.