---
url: >-
  https://acquirer-api-docs-v4-en.pingpongx.com/en/notes/technicalterm/transactionId/index.md
description: >-
  transactionId is a string or number used to uniquely identify a transaction,
  ensuring the security and correctness of online transactions and peer-to-peer
  transfers. In PingPongCheckOut, transactionId specifically refers to the
  PingPong transaction serial number, suitable for tracking and managing
  transaction processes.
---
## transactionId Parameter Description

:::note Note
transactionId usually refers to the transaction identifier, which is a string or number used to uniquely identify a transaction. Whether it's an online transaction or a peer-to-peer transfer, transactionId needs to be used to ensure the security and correctness of the transaction.
:::

In the PingPongCheckOut documentation, transactionId represents the PingPong transaction serial number.