Factuarea API
Pro-forma invoices

Find a proforma by external ID

Look up a single proforma by its external_id (sent in the JSON body), the integration key that maps it to a record in a third-party system (ERP/CRM/e-commerce). Returns the matching proforma or 404 proforma_not_found if no proforma uses that external_id within your company.

POST
/proformas/find-by-external-id

Authorization

AuthorizationBearer <token>

In: header

Header Parameters

Factuarea-Version?string

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.

Formatdate
X-Active-Profile?string

Operate 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.

Formatuuid

Request 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

application/json

import { Factuarea } from "@factuarea/sdk";const factuarea = new Factuarea({ apiKey: process.env.FACTUAREA_API_KEY! });const result = await factuarea.proformas.findByExternalId({    // request body — see the schema below  });
{
  "data": {
    "id": "01931b3e-7c4a-7f2e-9a8b-3c5d6e7f8a05",
    "object": "proforma",
    "number": "PRO-2026-00007",
    "series": {
      "id": "01931b3e-7c4a-7f2e-9a8b-3c5d6e7f8a0e",
      "code": "F-2026"
    },
    "client": {
      "id": "01931b3e-7c4a-7f2e-9a8b-3c5d6e7f8a01",
      "name": "Acme Corporation"
    },
    "status": "draft",
    "issued_on": "2026-01-22",
    "valid_until": "2026-02-21",
    "validity_days": 30,
    "reference": "REF-API-2026-001",
    "converted_to_id": null,
    "converted_invoice_number": "F-2025-003",
    "subtotal": 1500,
    "taxes_total": 315,
    "total_vat": 315,
    "total_retention": 0,
    "total_surcharge": 0,
    "total": 1815,
    "shipping_cost": 15.5,
    "total_with_shipping": 1830.5,
    "currency": "EUR",
    "payment_method": "bank_transfer",
    "payment_terms_days": 30,
    "delivery_terms": "Entrega en 5 dias habiles, portes incluidos",
    "estimated_delivery_date": "2026-06-10",
    "notes": "Proforma pendiente de validación.",
    "terms_and_conditions": "Validez 30 dias. Proforma sin valor fiscal hasta su conversion en factura.",
    "external_id": "ERP-PRO-2026-0007",
    "lines": [
      {
        "object": "proforma_line",
        "description": "Setup inicial",
        "product": {
          "id": "01931b3e-7c4a-7f2e-9a8b-3c5d6e7f8a09",
          "name": "Consultoría hora estándar"
        },
        "quantity": 1,
        "unit_price": 1500,
        "tax_rate": 21,
        "retention_rate": 0,
        "surcharge_rate": 0,
        "discount_percent": 0,
        "subtotal": 1500,
        "taxes": 315,
        "total": 1815,
        "indirect_tax_regime": "iva"
      }
    ],
    "metadata": {
      "erp_code": "IVA-GEN",
      "ledger_account": "477000"
    },
    "tags": [
      "exportacion",
      "pendiente-validar"
    ],
    "custom_fields": [
      {
        "field": "incoterm",
        "value": "EXW"
      }
    ],
    "link_expires_at": "2026-07-01T09:53:23+02:00",
    "link_is_active": true,
    "created_at": "2026-01-22T09:10:00Z",
    "updated_at": "2026-01-22T09:10:00Z"
  }
}

{
  "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": "idempotency_error",
    "code": "idempotency_key_reused",
    "message": "La cabecera `Idempotency-Key` ya se usó con un body distinto. Usa una clave nueva o reenvía exactamente el mismo body.",
    "param": null,
    "doc_url": "https://docs.factuarea.com/guides/errors#idempotency_key_reused",
    "request_id": "req_01HKQS5NHT9A4U7R2E3F8GZWTJ"
  }
}

{
  "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"
  }
}
POST

Duplicate a proforma

GET

List all proformas