What parameters does POST /V1/guest-carts/:cartId/billing-address accept?

This endpoint accepts 3 parameters: cartId (string) required; address (Magento\Quote\Api\Data\AddressInterface) required; useForShipping (bool).

Does POST /V1/guest-carts/:cartId/billing-address require authentication?

This endpoint can be called anonymously — no Authorization header required.

MageSmith

POSTQuote · Magento 2.4.9 Anonymous

POST /V1/guest-carts/:cartId/billing-address

Q: What does the POST /V1/guest-carts/:cartId/billing-address endpoint do in Magento 2?

POST /V1/guest-carts/:cartId/billing-address is a Magento 2 REST endpoint in the Quote module. Assign a specified billing address to a specified cart. Callable anonymously — no Authorization header required.

POST /V1/guest-carts/:cartId/billing-address is a Magento 2 REST endpoint in the Quote module. Assign a specified billing address to a specified cart. Callable anonymously — no Authorization header required.

Last verified: 2026-05-23 against Magento 2.4.9.

Returns

int

Address ID.

Service contract

Magento\Quote\Api\GuestBillingAddressManagementInterface::assign

Authorization

Anonymous — no Authorization header required.

Path parameters

cartId string Required

The cart ID.

Body parameters

address Magento\Quote\Api\Data\AddressInterface Required

Billing address data.

useForShipping bool default: false

Example request

Auto-generated from the service contract — paste-ready against your store's /rest/default base. Replace the host, store code, ACL token, and any required values before running.

Headers

application/json

Content-Type

application/json

Path

/V1/guest-carts/{cartId}/billing-address

Body

{
  "address": {
    "city": "",
    "company": "",
    "country_id": "",
    "custom_attributes": [
      {
        "attribute_code": "",
        "value": ""
      }
    ],
    "customer_address_id": 0,
    "customer_id": 0,
    "email": "",
    "extension_attributes": {},
    "fax": "",
    "firstname": "",
    "id": 0,
    "lastname": "",
    "middlename": "",
    "postcode": "",
    "prefix": "",
    "region": "",
    "region_code": "",
    "region_id": 0,
    "same_as_billing": 0,
    "save_in_address_book": 0,
    "street": [
      {}
    ],
    "suffix": "",
    "telephone": "",
    "vat_id": ""
  },
  "useForShipping": false
}