In order to set the Apple Pay billing and shipping address info for your Printicular order:

>Go to your device settings

iPhone Device Settings

>Select Passbook & Apple Pay

Passbook and Apple Pay

>Add a Credit Card.

>Under Transaction Defaults, select “Billing Address” and “Shipping Address”

Apple Pay Address

>Enter a new billing and/or shipping address. Select Done.

>Whichever billing or shipping address has a check mark next to it, will be the one used for your Printicular home delivery order.

>Check the address you would like to use.

>Launch the Printicular App.  Then place your home delivery order thru Printicular using Apple Pay (note: updating the shipping and billing information will not affect any previous Printicular orders, just future orders).