---
displayed_sidebar: promotionReference
---

import { TypeList } from "docs-ui"

# AddShippingMethodAdjustment

This action indicates that an adjustment must be made on a shipping method. For example, make the shipping method free.

<TypeList types={[{"name":"action","type":"`\"addShippingMethodAdjustment\"`","description":"The type of action.","optional":false,"defaultValue":"","expandable":false,"children":[]},{"name":"shipping_method_id","type":"`string`","description":"The associated shipping method's ID.","optional":false,"defaultValue":"","expandable":false,"children":[]},{"name":"amount","type":"[BigNumberInput](../../types/promotion.BigNumberInput/page.mdx)","description":"The amount to remove off the shipping method's total.","optional":false,"defaultValue":"","expandable":false,"children":[{"name":"value","type":"`string` \\| `number`","description":"","optional":false,"defaultValue":"","expandable":false,"children":[]},{"name":"numeric","type":"`number`","description":"","optional":false,"defaultValue":"","expandable":false,"children":[]},{"name":"raw","type":"[BigNumberRawValue](../../types/promotion.BigNumberRawValue/page.mdx)","description":"","optional":true,"defaultValue":"","expandable":false,"children":[{"name":"value","type":"`string` \\| `number`","description":"","optional":false,"defaultValue":"","expandable":false,"children":[]}]},{"name":"bigNumber","type":"`BigNumber`","description":"","optional":true,"defaultValue":"","expandable":false,"children":[]}]},{"name":"code","type":"`string`","description":"The promotion's code.","optional":false,"defaultValue":"","expandable":false,"children":[]},{"name":"description","type":"`string`","description":"The promotion's description.","optional":true,"defaultValue":"","expandable":false,"children":[]}]} expandUrl="https://docs.medusajs.com/learn/fundamentals/data-models/manage-relationships#retrieve-records-of-relation" sectionTitle="AddShippingMethodAdjustment"/>