Optional ReadonlycurrencyOptional Readonlycustomer_Optional Readonlycustomer_Optional ReadonlydateOptional ReadonlydeadlineOptional ReadonlydiscountOptional Readonlyexternal_Optional Readonlyinvoice_Optional ReadonlylanguageOptional Readonlypdf_Optional Readonlypdf_Optional Readonlypdf_Optional Readonlyspecial_
Payload for updating a draft customer invoice.