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Indicates how Square delivers the invoice to the customer.

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Directs Square to send invoices, reminders, and receipts to the customer using email.

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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 (public_url) with the customer to request payment.

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Directs Square to send invoices and receipts to the customer using SMS (text message).

You cannot set SMS as a delivery method using the Invoices API, but you can change an SMS delivery method to EMAIL or SHARE_MANUALLY.