Standalone Selling Price Overrides on Contracts

You can now set a line's standalone selling price (SSP) through declared_ssp when creating
contracts, instead of using the product's SSP. Send a monetary amount with amount and currency.

• POST /contracts accepts overrides for FULL and REVENUE_RECOGNITION_ONLY contracts.
  For FULL, the value is per unit in the line price's billing interval. For
  REVENUE_RECOGNITION_ONLY, it is the item's total standalone value.
• POST /draft-contracts and PUT /draft-contracts/{draft_contract_id} accept overrides for
  FULL drafts. The override is returned on draft responses and preserved when the draft is activated.
• Omit declared_ssp or send null to use the product's SSP. Replacing a draft without the field
  clears its override. Active contract updates cannot change SSP.
• Contract responses return the saved override as declared_ssp, preserving decimal precision.
  The field is omitted when the product's SSP is used.

Overrides require SSP revenue recognition to be enabled and a fixed recurring or one-time product
included in SSP allocation. Values must be positive and use the line price's currency. Overrides
are not supported on usage prices, bundle lines, or invoice-based revenue drafts.

Applies to V4 only.