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

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

const registration = await client.customers.taxIdentifiers.update(
  'cus_UkLWZg9DAJ',
  'txi_UkLWZg9DAJ',
  { value: 'DE123456789' },
)

spree api patch /customers/{customer_id}/tax_identifiers/{id} -d '{"value":"DE123456789"}'

{
  "id": "txi_UkLWZg9DAJ",
  "kind": "eu_vat",
  "value": "DE100000008",
  "validation_status": null,
  "validation_evidence": null,
  "source": null,
  "validated_at": null,
  "created_at": "2026-01-15T12:00:00.000Z",
  "updated_at": "2026-01-15T12:00:00.000Z",
  "validatable": false,
  "customer_id": "cust_UkLWZg9DAJ",
  "cart_id": null,
  "order_id": null
}