---
title: Unique IDs with Transaction Service
description: Integrators can protect themselves against duplicate transactions by utilizing the optional unique ID. This value will be used with UUIDs or other system-generated IDs as an additional mechanism for v
---

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# Unique IDs with Transaction Service

Integrators can protect themselves against duplicate transactions by utilizing the optional unique ID. This value will be used with UUIDs or other system-generated IDs as an additional mechanism for verifying against duplicate transactions if, for example, an API call is disrupted in transit and you don’t receive a response. 

When a unique ID is resubmitted, the transaction is not reprocessed. Instead, the requestErrorList will contain an apiFieldNameList with the arrivalId of the original transaction. 

 

**API Documentation**

Search for uniqueRequestId in [https://apidocs.pdcflow.com/#cardtransaction-object](https://apidocsalpha.pdcflow.com/#cardtransaction-object) and [https://apidocs.pdcflow.com/#achtransaction-object](https://apidocsalpha.pdcflow.com/#achtransaction-object) 

 

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