Officially speaking we do not fully support Shopify POS, but this in our pipeline. Here is what we already support:
When a customer completes a purchase and provides their email address and accepts to receive marketing email they are automatically enrolled in your rewards program.
When a customer completes a purchase and provides their email address and accepts to receive marketing or is a member of your rewards program they will automatically be credited for the order (assuming you set up a loyalty rule).
The following features are not supported:
Redemption on POS is not supported. You are still able to debit your customers manually from the Beans interface.
Depending on your order volume you may still want to use Beans with your Shopify POS, knowing that the redemption process is not yet integrated. If you do, please let us know if you face any bug.