Free text the payer shows a contractor while they draft an invoice. A write that enables the setting is accepted only with non-empty text, enforced by the payments service — to clear the text, omit value or switch the setting off rather than sending an empty string.

Restricts invoices to the listed currencies. Enabled with an empty list means the payer's default account currency, and a GET reports that currency rather than an empty list — the response to a PATCH reports the empty list as stored, so read it back to see the effective value. A currency removed from value is not currently removed from the stored list. A stored code this API no longer recognises is omitted from a read, so a policy whose every code is unrecognised reads as an empty list.

Forces the invoice due date to a fixed number of days out. A write is accepted only for 0, 7, 15 or 30, enforced by the payments service. No enum is declared here because the value is validated on write only while the setting is enabled, so a stored policy can hold another number and a read has to be able to report it. The bounds are the wire field's: it is a 32-bit integer.