PoppinPay is definitely geared towards pickup, that's for sure.

The other challenge is currently the app doesn't capture a phone number, so there isn't a way to contact any customer who wasn't already in your customer database. (This is supposed to be fixed in an app update soon)

Give Ronnie and the gang a call or message @caferaik here and request the feature: they have been fantastic with me on tweaks on the back end and keeping me in the loop on new features they're working on.

For the time being, you may be able to add a delivery item to the app. Make a specail category for it like "Want us to deliver?", have a "delivery address" item (created in square) and for the item description have it say "In the Additional Note section, please enter your delivery address." If that isn't filled out, you can assume the customer wants a pickup order.