---
page_source: https://docs.juspay.io/upi-inapp/flutter/miscellaneous/generating-upi-request-id
page_title: Generating UPI Request ID
---


## Generating UPI Request ID



 The merchant should generate upiRequestId following these criterias: 

* upiRequestId should be an alphanumeric 35 length string.
* It should start with a 3 character prefix which is given by NPCI for every handle. Example: "AXBfcd764aeab2a4bd195b25d652c1887f7" where AXB is the prefix.


###   Code snippet for upi request id generation


> **Note**
> let str = uuid.v4().replace(/-/g, "");return txnIdPrefix + str.substr(0, 32)