We have a pos solution done in C# and want it over as a ios/android app using XAMARIN
1. gets all products from web service
2. ability to scan with barcode scanner (bluetooth) to add in cart
3. gift card / refunds (partial or all order)
4. payment gateway - api from 3rd party card terminal, Klarna and VIPPS integration
5. cash payment that opens cash drawer
6. Print receipt
7. Some charts regarding daily sales etc
8. make x and z reports
9. can have a customer screen
10. Ability to have multi tabs where you can add Products that you want to Access quick
11. Have gotten some feedback that the old solution hangs and is not too responsive. That makes caching and good code important so it is very stable and quick to respond.
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We also need a update on the design for the PAD so it look more 2018. The POS was made 4 years ago and design is quite out of date. Also swipe functionality and easier navigation is important to think about. Also open for sugestions on improvements.