const options = {
  method: 'PATCH',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    first_name: 'Ada',
    last_name: 'Lovelace',
    selected_locale: 'de',
    avatar: '<string>'
  })
};

fetch('http://{defaultHost}/api/v3/seller/me', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

curl --request PATCH \
  --url http://{defaultHost}/api/v3/seller/me \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "first_name": "Ada",
  "last_name": "Lovelace",
  "selected_locale": "de",
  "avatar": "<string>"
}
'

{
  "user": {
    "id": "adm_UkLWZg9DAJ",
    "email": "kala@rosenbaummoen.info",
    "first_name": "Ada",
    "last_name": "Lovelace",
    "full_name": "Ada Lovelace",
    "created_at": "2026-01-15T12:00:00.000Z",
    "avatar_url": null,
    "selected_locale": null
  },
  "sellers": [
    {
      "id": "sel_UkLWZg9DAJ",
      "name": "Seller 56",
      "slug": "seller-56",
      "status": "approved"
    }
  ],
  "permissions": [],
  "permission_keys": []
}

{
  "error": {
    "code": "authentication_required",
    "message": "Authentication required"
  }
}

{
  "error": {
    "code": "validation_error",
    "message": "Avatar has an invalid content type (authorized content types are PNG, JPG, GIF, WEBP)",
    "details": {
      "avatar": [
        "has an invalid content type (authorized content types are PNG, JPG, GIF, WEBP)"
      ]
    }
  }
}