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

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

// A business registration outranks the buyer's own when the sale is for that business.
const registration = await client.companies.taxIdentifiers.create('comp_UkLWZg9DAJ', {
  kind: 'eu_vat',
  value: 'DE123456789',
})

spree api post /companies/{company_id}/tax_identifiers -d '{"kind":"eu_vat","value":"DE123456789"}'

{
  "id": "txi_gbHJdmfrXB",
  "kind": "gb_vat",
  "value": "GB123456789",
  "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": null,
  "cart_id": null,
  "order_id": null
}

{
  "error": {
    "code": "validation_error",
    "message": "Registration type has already been taken",
    "details": {
      "kind": [
        {
          "value": "eu_vat",
          "code": "taken",
          "message": "has already been taken",
          "specific": false
        }
      ]
    }
  }
}