I have provided API for merchants to send receipt to their customer as well, which has an example here: http://binceipt.com/webservice_guide.html
20 receipts for $1.99 is way too expensive man and even more expensive the paper receipt. I guess 200 receipts for $0.99 make more sense.
$100 for my source code? In your f*cking wet dream, nanijoe and you can shove that $100 bill into your ass.
I am confident that there is a market for this as there are already more than 20 active users.
I am currently converting binceipt to native app.