Purchase Order Number on Contracts
August 18th, 2026
POST /contracts now accepts an optional purchase_order_number on full-scope contracts.
When set, the value is copied onto every invoice the contract generates, so a customer's PO reference
flows through to their invoices automatically. Omit it to leave invoices without a PO. The value is
limited to 50 characters; a longer value is rejected with a validation error.
Applies to V4 only.