i have some knowledge about IOT and have engineering knowledge so my idea is to make hotel without Recepion only user go to door and scan bar code send money to hotel wallet when all Done door can open using phone for 24 hour .
about engineering side i can do it . but how
1) make wallet auto check value and when only right value happen make action .
2) what can do if user send higher or lower amount ?
3)how can make wallet auto check prices because bitcoin price changes fast and cant edit it manually