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Product Updates 422, 421, and 420: Fraud prevention headers for version 3.0 improved for MTD (UK legislation)

Her Majesty's Revenue and Customs (HMRC) department now requires the system to submit the header data for every request to their API. Effective January 2021, two new headers and a format have been issued for the parameter values of the existing fraud prevention headers.

Please make sure that your system is updated before submitting the next VAT return. Failure to comply to the new requirement by July 2021 may cause rejection from HMRC.

The new headers are as follows:





This header is a timestamp that displays when the local IPs of the clients are collected.

Gov-Client-Local-IPs-Timestamp: 2020-09-21T10:30:05.123Z


This header displays the name of the marketed product to end users.

Gov-Vendor-Product-Name: Product%20Name

The new format is as follows:





This format identifies the operating system and device.

Gov-Client-User-Agent: os-family=Windows&os-version=Server%202012&device-manufacturer=Dell%20Inc.&device-model=OptiPlex%20980

For more information, see Product Updates 420 and 419: Fraud prevention headers improved for MTD (UK legislation).

 Main Category: Attachments & notes  Document Type: Release notes detail
 Category:  Security  level: All - 0
 Sub category:  Document ID: 29.999.676
 Assortment:  Date: 05-04-2021
 Release:  Attachment: