Find a client by tax ID
Look up a client by their Spanish tax identifier (NIF/CIF/NIE). Returns the matching client or 404 if no client uses that tax_id within your company.
In: header
Header Parameters
Pin the API version (YYYY-MM-DD, Stripe-style date versioning) for this request; omit to use the key's pinned version, or the latest if none. Unsupported version → 400 unsupported_api_version; malformed → 400 parameter_invalid_format. The effective version is echoed in the Factuarea-Version response header. See the Versioning guide.
dateOperate on behalf of a child company (gestoría master key): pass its public id (UUID v7) and the request runs against that child's data without changing the key's scope, tier or environment (omit to use the key's own company). Invalid UUID → 400 parameter_invalid_uuid; unknown or non-owned id → 404 profile_not_found. See the Acting on behalf guide.
uuidRequest Body
application/json
TypeScript Definitions
Use the request body type in TypeScript.
Response Body
application/json
application/json
application/json
application/json
application/json
application/json
import { Factuarea } from "@factuarea/sdk";const factuarea = new Factuarea({ apiKey: process.env.FACTUAREA_API_KEY! });const result = await factuarea.clients.findByTaxId({ // request body — see the schema below });{
"data": {
"id": "01931b3e-7c4a-7f2e-9a8b-3c5d6e7f8a01",
"object": "client",
"name": "Acme Corporation",
"commercial_name": "Acme SL",
"tax_id": "B12345678",
"vat_id": "ESB12345678",
"email": "billing@acme.com",
"phone": "+34 600 123 456",
"fax": "+34 91 123 45 68",
"mobile": "+34 600 000 000",
"website": "https://acme.com",
"contact_person": "Juan García",
"billing_emails": [
"facturacion@acme.com",
"contabilidad@acme.com"
],
"address": {
"line1": "Calle Mayor 1",
"line2": "Edificio Central",
"number": "42",
"floor": "3",
"door": "B",
"staircase": "A",
"postal_code": "28001",
"city": "Madrid",
"province": "Madrid",
"country": "ES"
},
"coordinates": {
"latitude": 39.4699,
"longitude": -0.3763
},
"default_discount": 5,
"default_vat_rate": 21,
"default_retention_rate": 15,
"is_surcharge_subject": false,
"bank_accounts": [
{
"object": "bank_account",
"iban": "ES9121000418450200051332",
"bic": "CAIXESBBXXX",
"is_default": true
}
],
"preferred_operation_regime": "general",
"accumulate_347": true,
"alternative_id": {
"object": "alternative_id",
"type": "tax_id_foreign",
"value": "EU123456789",
"country_code": "FR"
},
"payment_preferences": {
"object": "payment_preferences",
"method": "bank_transfer",
"terms_days": 30
},
"dir3_accounting_office": "L01280796",
"dir3_managing_body": "L01280796",
"dir3_processing_unit": "L01280796",
"external_id": "CRM-99",
"notes": "Pago al contado.",
"metadata": {
"erp_code": "IVA-GEN",
"ledger_account": "477000"
},
"is_active": true,
"created_at": "2026-01-15T10:30:00Z",
"updated_at": "2026-01-15T10:30:00Z"
}
}{
"error": {
"type": "authentication_error",
"code": "missing_api_key",
"message": "No se ha proporcionado una API key válida en el header Authorization.",
"param": null,
"doc_url": "https://docs.factuarea.com/guides/errors#missing_api_key",
"request_id": "req_01HKQS5N8VR7QXJ9K3T6BWPMZA"
}
}{
"error": {
"type": "authorization_error",
"code": "insufficient_scope",
"message": "Esta API key no tiene el scope requerido para esta operación.",
"param": null,
"doc_url": "https://docs.factuarea.com/guides/errors#insufficient_scope",
"request_id": "req_01HKQS5NBC3P8M1KX4V7SLNHQD"
}
}{
"error": {
"type": "invalid_request_error",
"code": "parameter_invalid",
"message": "El campo `name` es obligatorio y no puede estar vacío.",
"param": "name",
"doc_url": "https://docs.factuarea.com/guides/errors#parameter_invalid",
"request_id": "req_01HKQS5NGS8Z3T6Q1D2E7FYVSI"
}
}{
"error": {
"type": "rate_limit_error",
"code": "rate_limit_exceeded",
"message": "Has excedido el rate limit de 60 peticiones por minuto. Reintenta tras 30 segundos.",
"param": null,
"doc_url": "https://docs.factuarea.com/guides/errors#rate_limit_exceeded",
"request_id": "req_01HKQS5NKW1C6W9T4G5H0JBZVL"
}
}{
"error": {
"type": "api_error",
"code": "internal_error",
"message": "Ha ocurrido un error inesperado. Si persiste, contacta con soporte adjuntando el request_id.",
"param": null,
"doc_url": "https://docs.factuarea.com/guides/errors#internal_error",
"request_id": "req_01HKQS5NLX2D7X0U5H6J1KCAWM"
}
}