Can I simulate with the sandbox opening a tab?

I only see the ability to accept a payment which is requiring defining a customer as well.

I want to simulate what would happen at an actual Square POS system in which the order is left open. Is there a way to do that with the current sandbox?

Hi @buddyp450 welcome to the forums!

There is no way to test POS in sandbox at this time unfortunately. Just FYI a payment does not require a customer to be created, though. An Open tab will also not be available in the API, so not sure if that’s what you’re trying to test either.