temsor API
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Turkish e-Invoice Builder

Builds a UBL-TR e-Invoice or e-Archive XML document from plain JSON, computing every total and validating the parties.

POST /v1/tr/invoice/build · 3 credits

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POST/v1/tr/invoice/build 
{
  "series": "ABC",
  "sequence": 123,
  "issueDate": "2026-07-26",
  "supplier": {
    "name": "Örnek Yazılım A.Ş.",
    "taxNumber": "4840847211",
    "taxOffice": "Kadıköy",
    "street": "Moda Cad.",
    "buildingNumber": "12",
    "district": "Kadıköy",
    "city": "İstanbul"
  },
  "customer": {
    "name": "Alıcı Ticaret Ltd. Şti.",
    "taxNumber": "3250566341",
    "taxOffice": "Beşiktaş",
    "city": "İstanbul"
  },
  "lines": [
    {
      "name": "Yazılım geliştirme hizmeti",
      "quantity": 10,
      "unitCode": "HUR",
      "unitPrice": 1500,
      "vatRate": 20
    }
  ]
}
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1endpoints
—data points banked
—time series
—median response

Why this exists

Built for hostile input

A Turkish address arrives as "Cd." or "Cad." or "Caddesi", with the flat number glued to the building number. Generic parsers drop half of it silently. This one tells you what it could not place.

History cannot be backfilled

The exchange-rate archive grows every business day and each point keeps its source URL and content hash. A competitor can read today’s bulletin too — nobody can produce last quarter’s.

You only pay for work

Repeated inputs come from cache and cost zero credits. If a response ever fails its own schema, the call is refunded automatically.

Endpointsexpand any row to see the parameters and call it live

Finance1

/v1/tr/invoice/build Turkish e-Invoice Builder 3 credits

Builds a UBL-TR e-Invoice or e-Archive XML document from plain JSON, computing every total and validating the parties.

Selling into Türkiye means issuing a UBL-TR document whose element order is fixed by schema and whose totals must agree to the kuruş, or the integrator rejects it. This endpoint takes the invoice as ordinary JSON and returns the XML. Totals you send are ignored on purpose — line amounts, per-rate VAT subtotals and the payable amount are all recomputed here, because a rounding difference of one kuruş is the most common rejection. VKN and TCKN checksums are verified, and the amount is written out in Turkish words as invoices require. It does not sign the document and does not transmit it: the financial seal and the submission to the tax authority belong to your certificate and your integrator. What comes back is a document ready to enter that step.

Parameters

profile "TEMELFATURA" | "TICARIFATURA" | "EARSIVFATURA" TEMELFATURA: no formal objection flow. TICARIFATURA: buyer may accept/reject. EARSIVFATURA: buyer is not an e-Invoice user. default "TEMELFATURA"
invoiceTypeCode "SATIS" | "IADE" default "SATIS"
id string Invoice number. Omit and supply `series` to have it built from the series and sequence.
series string Three-letter series code, used with `sequence`.
sequence integer Sequence number within the series and year.
uuid string Document UUID (ETTN). Generated when omitted.
issueDate* string
issueTime string
currency string ISO 4217. Anything other than TRY requires `exchangeRate`. default "TRY"
exchangeRate number Units of TRY per one unit of `currency`.
supplier* object
customer* object
lines* object[]
notes string[] default []
amountInWords boolean Adds the payable amount written out in Turkish words as a note, the way invoices require. default true
despatchDocumentId string Delivery note number, if the goods shipped separately.
orderReferenceId string
POST/v1/tr/invoice/build 
{
  "series": "ABC",
  "sequence": 123,
  "issueDate": "2026-07-26",
  "supplier": {
    "name": "Örnek Yazılım A.Ş.",
    "taxNumber": "4840847211",
    "taxOffice": "Kadıköy",
    "street": "Moda Cad.",
    "buildingNumber": "12",
    "district": "Kadıköy",
    "city": "İstanbul"
  },
  "customer": {
    "name": "Alıcı Ticaret Ltd. Şti.",
    "taxNumber": "3250566341",
    "taxOffice": "Beşiktaş",
    "city": "İstanbul"
  },
  "lines": [
    {
      "name": "Yazılım geliştirme hizmeti",
      "quantity": 10,
      "unitCode": "HUR",
      "unitPrice": 1500,
      "vatRate": 20
    }
  ]
}
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Use it from an AI assistantthe same catalogue, exposed as MCP tools

Every endpoint is also published over the Model Context Protocol, so Claude, ChatGPT or your own agent can call it directly — no glue code, no wrapper functions. The assistant sees the same input schemas and the same metering.

Currently 14 tools. New endpoints appear automatically; nothing to update on your side.

claude_desktop_config.json

{
  "mcpServers": {
    "temsor": {
      "url": "https://api.temsor.com/mcp",
      "headers": { "x-api-key": "fk_live_…" }
    }
  }
}

Quickstart

Official client: npm install temsor-api · npmjs.com/package/temsor-api

Node.js

import Client from "temsor-api";

const api = new Client({ apiKey: KEY });
const r = await api.${(() => {
  const first = apis[0];
  return first.slug.split(/[/-]/).map((p, i) => (i === 0 ? p : p[0].toUpperCase() + p.slice(1))).join('');
})()}(${esc(JSON.stringify(apis[0].examples[0]?.input ?? {}))});
console.log(r, r.$meta);

cURL

curl -s https://api.temsor.com/v1/tr/invoice/build \
  -H "content-type: application/json" \
  -H "x-api-key: fk_live_…" \
  -d '{"series":"ABC","sequence":123,"issueDate":"2026-07-26","supplier":{"name":"Örnek Yazılım A.Ş.","taxNumber":"4840847211","taxOffice":"Kadıköy","street":"Moda Cad.","buildingNumber":"12","district":"Kadıköy","city":"İstanbul"},"customer":{"name":"Alıcı Ticaret Ltd. Şti.","taxNumber":"3250566341","taxOffice":"Beşiktaş","city":"İstanbul"},"lines":[{"name":"Yazılım geliştirme hizmeti","quantity":10,"unitCode":"HUR","unitPrice":1500,"vatRate":20}]}'

JavaScript

const res = await fetch("https://api.temsor.com/v1/tr/invoice/build", {
  method: "POST",
  headers: { "content-type": "application/json", "x-api-key": KEY },
  body: JSON.stringify({"series":"ABC","sequence":123,"issueDate":"2026-07-26","supplier":{"name":"Örnek Yazılım A.Ş.","taxNumber":"4840847211","taxOffice":"Kadıköy","street":"Moda Cad.","buildingNumber":"12","district":"Kadıköy","city":"İstanbul"},"customer":{"name":"Alıcı Ticaret Ltd. Şti.","taxNumber":"3250566341","taxOffice":"Beşiktaş","city":"İstanbul"},"lines":[{"name":"Yazılım geliştirme hizmeti","quantity":10,"unitCode":"HUR","unitPrice":1500,"vatRate":20}]})
});
const { data } = await res.json();

Python

import httpx
r = httpx.post("https://api.temsor.com/v1/tr/invoice/build",
    headers={"x-api-key": KEY},
    json={"series":"ABC","sequence":123,"issueDate":"2026-07-26","supplier":{"name":"Örnek Yazılım A.Ş.","taxNumber":"4840847211","taxOffice":"Kadıköy","street":"Moda Cad.","buildingNumber":"12","district":"Kadıköy","city":"İstanbul"},"customer":{"name":"Alıcı Ticaret Ltd. Şti.","taxNumber":"3250566341","taxOffice":"Beşiktaş","city":"İstanbul"},"lines":[{"name":"Yazılım geliştirme hizmeti","quantity":10,"unitCode":"HUR","unitPrice":1500,"vatRate":20}]})
data = r.json()["data"]