ConnectApi.AdjustItemInputRepresentation

A price adjustment to an OrderItemSummary. It only supports discounts, not increases.

Property	Type	Description	Required or Optional	Available Version
`adjustmentType`	String	Describes how the amount is calculated. It can have one of these values: `AmountWithTax`—Value of amount is the adjustment, including tax. `AmountWithoutTax`—Value of amount is the adjustment, not including tax. Tax is calculated on the value and added. `Percentage`—Value of amount is a percentage discount. It is divided by 100, and then multiplied by the TotalPrice and TotalTaxAmount of the OrderItemSummary to determine the adjustment amount.	Required	49.0
`amount`	Double	Value used to calculate the adjustment amount, as described by the adjustmentType. It must be a negative value.	Required	49.0
`description`	String	Description of the adjustment.	Optional	49.0
`orderItemSummaryId`	String	ID of the OrderItemSummary.	Required	49.0
`reason`	String	Reason for the adjustment. The value must match one of the picklist values on the Reason field of the OrderItemSummaryChange object.	Required	49.0

Apex Reference Guide