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---
title: "unique identifier"
type: definition
status: Published
source: "PSD2 Article 4, point (33)"
defined_term: "unique identifier"
source_regulation: "PSD2"
source_reference: "Article 4, point (33)"
source_node: "eu.psd2.article.4.subparagraph.1.point.33"
cross_regime_auto_link: false
inline_links: pending
text_version: "Consolidated version of 17 January 2025"
source_url: "https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:02015L2366-20250117"
check_status: matched
verified: true
last_checked: 2026-10-26
---

*In force · PSD2 Article 4, point (33) · Consolidated version of 17 January 2025 · Checked against EUR-Lex on 26 Oct 2026 · [Official source](https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:02015L2366-20250117)*

## Definition

> **(33)** ‘**unique identifier**’ means a combination of letters, numbers or symbols specified to the payment service user by the payment service provider and to be provided by the payment service user to identify unambiguously another payment service user and/or the payment account of that other payment service user for a payment transaction;

## Source

[PSD2, Article 4, point (33)](https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:02015L2366-20250117).