> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mercurjs.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Upsert Seller Address

> Create or update a seller's address.

Creates the seller's address if none exists, otherwise updates it.

## Path parameters

<ParamField path="id" type="string" required>The seller's ID.</ParamField>

## Query parameters

<ParamField query="fields" type="string">Comma-separated list of fields to include, prefix with `+`/`-` to add or remove from defaults.</ParamField>

## Body parameters

<ParamField body="name" type="string">Label for the address.</ParamField>
<ParamField body="company" type="string">Company name.</ParamField>
<ParamField body="first_name" type="string">First name of the contact person.</ParamField>
<ParamField body="last_name" type="string">Last name of the contact person.</ParamField>
<ParamField body="address_1" type="string">First address line.</ParamField>
<ParamField body="address_2" type="string">Second address line.</ParamField>
<ParamField body="city" type="string">City.</ParamField>
<ParamField body="country_code" type="string">Two-letter ISO country code.</ParamField>
<ParamField body="province" type="string">Province or state.</ParamField>
<ParamField body="postal_code" type="string">Postal code.</ParamField>
<ParamField body="phone" type="string">Phone number for the address.</ParamField>
<ParamField body="metadata" type="object">Custom key-value data.</ParamField>
<ParamField body="additional_data" type="object">Extra data passed to workflow hooks.</ParamField>

## Response

<ResponseField name="seller" type="object">
  <Expandable title="properties">
    <ResponseField name="id" type="string">The seller's ID.</ResponseField>

    <ResponseField name="address" type="object">
      <Expandable title="properties">
        <ResponseField name="address_1" type="string">First address line.</ResponseField>
        <ResponseField name="city" type="string">City.</ResponseField>
        <ResponseField name="country_code" type="string">Two-letter ISO country code.</ResponseField>
        <ResponseField name="postal_code" type="string">Postal code.</ResponseField>
      </Expandable>
    </ResponseField>

    <ResponseField name="updated_at" type="string">Last update timestamp.</ResponseField>
  </Expandable>
</ResponseField>

<RequestExample>
  ```bash cURL theme={null}
  curl -X POST 'http://localhost:9000/admin/sellers/sel_01HXYZABCDEF/address' \
    -H 'Authorization: Bearer <token>' \
    -H 'Content-Type: application/json' \
    -d '{
      "address_1": "123 Market St",
      "city": "San Francisco",
      "country_code": "us",
      "postal_code": "94103"
    }'
  ```

  ```ts JS Client theme={null}
  const { seller } = await client.admin.sellers.$id.address.mutate({
    $id: "sel_01HXYZABCDEF",
    address_1: "123 Market St",
    city: "San Francisco",
    country_code: "us",
    postal_code: "94103",
  })
  ```
</RequestExample>

<ResponseExample>
  ```json 200 theme={null}
  {
    "seller": {
      "id": "sel_01HXYZABCDEF",
      "name": "Acme",
      "status": "open",
      "address": {
        "address_1": "123 Market St",
        "city": "San Francisco",
        "country_code": "us",
        "postal_code": "94103"
      },
      "updated_at": "2026-06-12T10:30:00.000Z"
    }
  }
  ```
</ResponseExample>