Indicates how Square delivers the invoice to the customer.
Directs Square to send the invoice, reminders, and receipts to the customer using email.
Directs Square to take no action on the invoice. In this case, the seller
or application developer follows up with the customer for payment. For example,
a seller might collect a payment in the Seller Dashboard or Point of Sale (POS) application.
The seller might also share the URL of the Square-hosted invoice page (