I'm looking for a way to allow visitors to my site to pay me for services. However, it will be up to the visitor to determine how much they're paying. Sort of like a donation, more or less.
However, I'll just go in later and apply any payments they've made to the balance in their account in my QuickBooks.
I would want to record these transactions so that I can sort through them later, and would like to process them through Authorize.net
Any suggestions? Any plugins (free or paid) that you've come across for this sort of thing?