const options = {
  method: 'PATCH',
  headers: {
    'x-spree-api-key': '<api-key>',
    Authorization: 'Bearer <token>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({label: 'Northern Warehouse', default_shipping: true})
};

fetch('http://{defaultHost}/api/v3/store/companies/{company_id}/addresses/{id}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

curl --request PATCH \
  --url http://{defaultHost}/api/v3/store/companies/{company_id}/addresses/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'x-spree-api-key: <api-key>' \
  --data '
{
  "label": "Northern Warehouse",
  "default_shipping": true
}
'

{
  "id": "addr_EfhxLZ9ck8",
  "label": "Northern Warehouse",
  "first_name": null,
  "last_name": null,
  "full_name": "",
  "address1": "280 Lovely Street",
  "address2": "Northwest",
  "postal_code": "10118",
  "city": "New York",
  "phone": "555-555-0199",
  "company": "Company",
  "country_name": "United States",
  "country_code": "US",
  "state_text": "NY",
  "state_code": "NY",
  "quick_checkout": false,
  "is_default_billing": false,
  "is_default_shipping": true,
  "state_abbr": "NY",
  "country_iso": "US",
  "state_name": "New York"
}