---
title: "Cielo IssuerTransactionId now required for Elo recurring, incremental and reauthorized transactions: 2026-10-02 | Harbyn"
description: "Cielo IssuerTransactionId now required for Elo recurring, incremental and reauthorized transactions, announced Oct 2, 2026."
canonical: "https://harbyn.com/changes/cielo/2026-10-02-issuertransactionid-obrigatorio-para-elo"
last-updated: 2026-10-02
---

# Cielo IssuerTransactionId now required for Elo recurring, incremental and reauthorized transactions

Markdown version of <https://harbyn.com/changes/cielo/2026-10-02-issuertransactionid-obrigatorio-para-elo>.

Breaking change - Cielo. medium severity. In effect.

IssuerTransactionId is now mandatory for Elo Recurring Payment, Incremental Authorization and Reauthorized Card Sale transactions. Merchants must store the identifier returned in the original customer-initiated transaction (CIT) and send it in every subsequent merchant-initiated transaction (MIT) of the same cycle.

## Facts

| Fact | Value |
| --- | --- |
| Vendor | [Cielo](https://harbyn.com/vendors/cielo.md) |
| Kind | Breaking change |
| Severity | medium |
| Status | In effect |
| Announced | Oct 2, 2026 |
| Added to Harbyn | Oct 2, 2026 |
| Lead time | No dated deadline |
| Symbols | `IssuerTransactionId` |
| Vendor page | <https://docs.cielo.com.br/ecommerce-cielo/changelog/issuertransactionid-elo> |
| Review | Reviewed by a person, extracted by a model |

## Find it in your code

```sh
npx harbyn scan
```

This change names no identifier the scanner can match line by line, so the scan tells you whether your repository uses Cielo, from its packages and API hosts. Nothing leaves your machine.

## Sources

Where this event comes from: the page we read, when we read it, and the hash of that snapshot.

- <https://docs.cielo.com.br/ecommerce-cielo/changelog.rss> (changelog, fetched 2026-10-02 22:20 UTC, sha256 `e3005669d98d3d4253d55126bfbf1cdd182594d50afcc281397b7c1dc0eb56a8`)

## Related changes

### More from Cielo

- [TransactionLinkId (TLID) required on Mastercard merchant-initiated transactions from October 23, 2026](https://harbyn.com/changes/cielo/2026-10-07-tlid-obrigatorio-para-transacoes-mit-mastercard.md) (Breaking change, effective Oct 23, 2026)

### Changes at other vendors

- [Asaas: Simples Nacional NFS-e integrations must migrate to the national portal by November 1](https://harbyn.com/changes/asaas/2026-10-20-nfs-e-migracao-obrigatoria-do-simples-nacional-para-o-portal-nacional-em-01-11-2.md) (effective Nov 1, 2026)
- [SEFAZ e-invoicing (NF-e, CT-e, MDF-e): CT-e drops EPEC and FSDA contingency on November 16, 2026](https://harbyn.com/changes/sefaz/2026-10-01-ct-e-ct-eos-and-gtv-e-layout-updates.md) (effective Nov 16, 2026)
- [Conta Azul: Financial account creation is synchronous](https://harbyn.com/changes/contaazul/2026-10-19-financial-account-creation-is-synchronous.md) (announced Oct 19, 2026)
- [NFS-e Nacional: Technical Note 009 v1.01 restructures the DPS and NFS-e layout for the tax reform](https://harbyn.com/changes/nfse-nacional/2026-10-01-nfs-e-layout-updates-for-the-consumption-tax-reform.md) (announced Oct 1, 2026)

[All upcoming deadlines](https://harbyn.com/deadlines.md)