Thanks! We use Square to handle credit card payments for conventions, but it's quite annoying to swap between an in-house iPad webapp that handles inventory, receipt printing, and sending the order data to a master database.
Allowing simple iOS protocol handlers like "square://pay?product1=Mug&price1=20.00&product2=Shirt&price2=22.00&callback=inventorify%3A%2F%2Fsquare_callback" and it callsback to url "inventorify://square_callback?success=true&paid=42.00" would be amazing as I don't have to have the awkward step of "Exit the inventorify app and charge the customer for $42.00 through the Square app" and then the cashier forgets the amount to charge for.