Create a customer address

import { createAdminClient } from '@spree/admin-sdk'

const client = createAdminClient({
  baseUrl: 'https://your-store.com',
  secretKey: 'sk_xxx',
})

const address = await client.customers.addresses.create('cus_UkLWZg9DAJ', {
  first_name: 'Jane',
  last_name: 'Doe',
  address1: '350 Fifth Avenue',
  city: 'New York',
  postal_code: '10118',
  country_iso: 'US',
  state_abbr: 'NY',
  phone: '+1 212 555 1234',
  label: 'Office',
  is_default_shipping: true,
})

spree api post /customers/{customer_id}/addresses -d '{"first_name":"Jane","last_name":"Doe","address1":"350 Fifth Avenue","city":"New York","postal_code":"10118","country_iso":"US","state_abbr":"NY","phone":"+1 212 555 1234","label":"Office","is_default_shipping":true}'

{
  "id": "addr_gbHJdmfrXB",
  "first_name": "Jane",
  "last_name": "Doe",
  "full_name": "Jane Doe",
  "address1": "350 Fifth Avenue",
  "address2": null,
  "postal_code": "10118",
  "city": "New York",
  "phone": "+12125551234",
  "company": null,
  "country_name": "United States of America",
  "country_iso": "US",
  "state_text": "NY",
  "state_abbr": "NY",
  "quick_checkout": false,
  "is_default_billing": false,
  "is_default_shipping": false,
  "state_name": "New York",
  "label": "Office",
  "metadata": {},
  "created_at": "2026-07-24T18:10:43.624Z",
  "updated_at": "2026-07-24T18:10:43.624Z",
  "customer_id": "cus_UkLWZg9DAJ"
}