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Invoice Dates on Contracts with Minimum Commitments

August 17th, 2026

The following endpoints now reject a contract with a nonzero minimum commitment when its invoicing
day or month_day does not match the contract's start_date:

  • POST /contracts
  • POST /contracts/{contract_id}/amendments
  • POST /contracts/{contract_id}/amendments/preview

Align the invoicing day or month_day with start_date when creating or amending these contracts.

This applies to contract-level minimum commitments in V1 through V4 and item-level minimum commitments
in V3 and V4. Invalid requests return HTTP 400 with error type
custom_invoice_date_not_allowed_with_minimum_commitment.