Canteen & Merch are generally simpler to process. We do not need to track attribute the sale to a customer so an anonymous sale is sufficient.
Go to Checkout
Click the desired items the appropriate number of times
Click on Review sale
Click on Charge
For different payment types:
Contactless payment, the customer needs to tap on your phone or the paired Square Reader
Cash: Click on Cash at the bottom and accept the sale
Other payment types: Click on More Payment Types to pick a different payment type. We currently have Cheques enabled.