billingContact
A prepopulated billing address.
Declaration
var billingContact: PKContact? { get set }Discussion
If you have an up-to-date billing address on file, you can set it here. This billing address appears in the payment sheet. The user can either use the address you specify or select a different address.
Note that a PKContact object that represents a billing contact contains information for only the postalAddress property. All other properties in the object are set to nil.