Fiscalization for large systems, on the pricing model you choose

The price, in the open

No price on request. Two models: you choose the one that fits your volume, and the contract and service are the same.

Which pays off: at roughly RSD 117 to the euro, the fixed model is cheaper from about 46,800 receipts a month per site, and below that the per-receipt model is.

Example, two sites (say a B2C shop and a marketplace): on the fixed model €1,600 a month and €5,000 one-off; on the per-receipt model RSD 2 for each receipt and €10,000 one-off.

Enterprise terms, version 1.0, updated 14 October 2026.

What the price includes

Everything in the Biznis plan, plus what a system with several channels and several legal entities needs.

• Everything in the Biznis plan, at Enterprise scale
• Split deliveries: advance and then final invoices according to your delivery policy
• Marketplace: invoices to the buyer under the seller's tax ID (PIB), commission through SEF
• External channels: websites, ERP, registers, parcel lockers and couriers issue invoices through the API
• Bank statements from several banks, reconciliation by bank and account
• Every invoice as both PDF and thermal, the same for all channels
• Multiple legal entities, white-label, SLA with on-call support

API documentation

REST with a JSON body, described in OpenAPI 3.1 (version 1.6.0). The specification is public and needs no key, so your team can import it into Postman, Swagger or a client generator before you sign.

Base URL

https://pos.narbiz.com

Format

JSON over HTTPS (TLS)

Authentication

The X-Tezga-Api-Key header; a key looks like tzg_ followed by 48 hexadecimal characters

Keys

Up to 20 named keys per company, one per system; each can be revoked on its own, made read-only and bound to a list of IP addresses

Body signature

HMAC-SHA256 in the X-Tezga-Signature header; once a secret is set, it is required for every write

Idempotency

By externalId: a repeated request returns the same document with the status postojalo (already existed), never a second receipt

Rate limits

120 writes and 240 reads a minute per company; for Enterprise raised up to 10,000 a minute

Size

Body up to 512 KB, up to 500 items per call

Environments

Production, the Tax Administration sandbox and simulation; the same key and the same code, and the environment is read from GET /tax-labels

All calls

curl -X POST "https://pos.narbiz.com/api/integrations/order?provider=custom" \
  -H "X-Tezga-Api-Key: tzg_…" \
  -H "X-Tezga-Signature: sha256=…" \
  -H "Content-Type: application/json" \
  -d '{
    "externalId": "WEB-100245981",
    "tok": "fiskalni",
    "nacinPlacanja": "Kartica",
    "cenaIzZahteva": true,
    "posaljiMejl": true,
    "kupac": { "naziv": "Kupac", "email": "kupac@primer.rs" },
    "stavke": [
      { "sifra": "JAK-0042", "naziv": "Jakna", "kolicina": 1,
        "cenaSaPdv": 12990, "poreskaStopa": "20" },
      { "naziv": "Dostava", "kolicina": 1, "cenaSaPdv": 390,
        "poreskaStopa": "20", "jedinicaMere": "usluga" }
    ]
  }'

{
  "ok": true,
  "status": "kreirano",
  "documentId": "b3f1…",
  "broj": "RAC2026000123",
  "statusDokumenta": "izdat",
  "ukupnoSa": "13380.00",
  "nacinPlacanja": "Kartica",
  "fiskalni": {
    "pfrBroj": "AB12CD34-AB12CD34-123",
    "pfrVreme": "2026-10-14T10:00:02.000Z",
    "brojacRacuna": "123/130ПП",
    "esirBroj": "1597/1.1",
    "verifikacioniUrl": "https://suf.purs.gov.rs/v/?vl=…"
  },
  "javniUrl": "https://pos.narbiz.com/r/7f3a…",
  "javniPdfUrl": "https://pos.narbiz.com/r/7f3a…/pdf"
}

javniUrl and javniPdfUrl work without signing in, so you can put them in the order confirmation. When the Tax Administration does not accept the receipt, the response is 202 with ok:false, the document stays issued and Tezga retries fiscalization on its own.

Response codes

200

Document issued and fiscalized, or it already existed (status postojalo).

202

Document issued, not yet accepted by the Tax Administration; Tezga retries fiscalization on its own.

400

The body is not valid JSON or a required field is missing.

401

The key is missing or wrong, or the signature does not match.

402

The subscription is not active or the plan does not include the API.

403

A read-only key, a register key, or an IP address outside the key's list.

404

The document was not found in your company.

409

The rules do not allow it, or the same request is being processed.

413

The body is larger than 512 KB.

422

The format is valid but the rules are not (for example a discount larger than the amount). Nothing was issued.

429

Rate limit exceeded; Retry-After says after how many seconds to retry.

Webhooks

Tezga sends a POST to your URL for the events racun.fiskalizovan, racun.greska, refundacija.izvrsena and storno.izvrsen. Every delivery carries the X-Tezga-Event, X-Tezga-Delivery and X-Tezga-Signature headers (HMAC-SHA256 of the body). If your server does not respond, delivery is retried after 1, 5, 15, 60 and 360 minutes. Up to 5 URLs per company, each with its own secret, and the body carries your externalId, so matching does not need Tezga's id.

POST /vas-webhook
X-Tezga-Event: racun.fiskalizovan
X-Tezga-Delivery: 5c0e…
X-Tezga-Signature: sha256=…

{
  "dogadjaj": "racun.fiskalizovan",
  "vreme": "2026-10-14T10:00:03.000Z",
  "tenantId": "…",
  "podaci": {
    "documentId": "b3f1…",
    "broj": "RAC2026000123",
    "fiskalni": { "pfrBroj": "AB12CD34-AB12CD34-123" },
    "externalId": "WEB-100245981",
    "provider": "custom"
  }
}

import { createHmac, timingSafeEqual } from "node:crypto";

export function potpisIspravan(telo, zaglavlje, tajna) {
  const ocekivano =
    "sha256=" + createHmac("sha256", tajna).update(telo).digest("hex");
  const a = Buffer.from(zaglavlje ?? "");
  const b = Buffer.from(ocekivano);
  return a.length === b.length && timingSafeEqual(a, b);
}

How onboarding works

1. 01

   A call

   With your technical and finance teams: channels, platforms, number of sites and legal entities.

2. 02

   Contract and NDA

   A contract for at least 3 years, the SLA and the data processing agreement; an NDA before we look into your systems.

3. 03

   Integration

   We connect your platform and ERP to Tezga and map sales, returns, advances and cancellations.

4. 04

   Test run

   The whole flow in the Tax Administration sandbox, with the same key and the same code as in production.

5. 05

   Production

   Going live means replacing the certificate on the account; the code and the API key stay the same.