# AddShippingMethodAdjustment

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

- action: (\`"addShippingMethodAdjustment"\`) The type of action.
- shipping\_method\_id: (\`string\`) The associated shipping method's ID.
- amount: (\[BigNumberInput]\(../../types/promotion.BigNumberInput/page.mdx)) The amount to remove off the shipping method's total.

  - value: (\`string\` \\| \`number\`)

  - numeric: (\`number\`)

  - raw: (\[BigNumberRawValue]\(../../types/promotion.BigNumberRawValue/page.mdx))

    - value: (\`string\` \\| \`number\`)

  - bigNumber: (\`BigNumber\`)
- code: (\`string\`) The promotion's code.
- description: (\`string\`) The promotion's description.