Hi, i spend the last 2 years creating this crypto request app bitrequest.io
It can be used as a Point of Sale, but you can also send payment requests to your friends with whatsapp, telegram, email etc.
Right now i am using mymonero's api for payment confirmations. (Don't know if this is ok). But i couldn't find any other public API's or get this working with RPC, so any assistance in that would be great. Please try it out and let me know what you think of it!
Disclaimer. Monero integration is still pretty fresh. I've been testing this a lot lately and think it's pretty save but don't request your life savings just yet.