wfirma-sdk

TypeScript SDK for the wFirma.pl API, generated from the official Postman collection.

Installation

npm install wfirma-sdk

Authentication

Create API keys in wFirma: Settings → Security → Applications → API Keys. You need accessKey, secretKey, and an integration appKey (docs).

import { WFirmaClient, createWFirmaModules } from "wfirma-sdk";

const client = new WFirmaClient({
  credentials: {
    accessKey: process.env.WFIRMA_ACCESS_KEY!,
    secretKey: process.env.WFIRMA_SECRET_KEY!,
    appKey: process.env.WFIRMA_APP_KEY!,
  },
  companyId: process.env.WFIRMA_COMPANY_ID,
});

const api = createWFirmaModules(client);

Usage

Invoices (typed module)

const invoice = await api.invoices.add({
  type: "normal",
  contractor: { name: "Acme Sp. z o.o.", nip: "5252525252" },
});

const found = await api.invoices.find();
const one = await api.invoices.get(123);
await api.invoices.send(123);

Any resource from the Postman collection

All resources from doc.wfirma.pl are available via resource():

await api.resource("contractors").add({
  name: "Kontrahent",
  zip: "00-001",
  country: "PL",
  nip: "1111111111",
});

await api.resource("goods").find({ limit: 20, page: 1 });
await api.resource("payments").get(99);

Supported resources include contractors, invoices, goods, payments, expenses, documents, webhooks, warehouse document types, and more. Run bun run generate:modules after syncing the collection to refresh definitions.

XML payloads

The API uses XML by default. The SDK builds and parses XML automatically. Pass a plain object for add / edit; it is wrapped in the correct <api><resource>…</resource></api> structure.

For full control, pass a raw XML string as body to client.request().

Development

Built with Vite library mode (ESM + CJS). XML requests use fast-xml-builder; responses are parsed with fast-xml-parser.

This project uses Bun for installs, scripts, and running TypeScript tooling.

Local playground (no build / npm publish)

Copy .env.example to .env and set ACCESS_KEY, SECRET_KEY, and APP_KEY. Bun loads .env automatically.

bun install
bun run dev                    # smoke test against live API (imports ../src)
bun run dev contractors find   # call a specific resource
bun run dev invoices get 123   # get by id

bun run dev uses --watch and reloads when you edit SDK source under src/.

bun run sync:postman    # download latest collection from doc.wfirma.pl
bun run generate:modules
bun run build           # only needed before publishing
bun run build:watch     # watch dist for library consumers
bun test
bun run typecheck

License

MIT