# Updating Anonymous contacts

**URL:** <https://forum.mautic.org/t/updating-anonymous-contacts/26560>\
**Category:** Product Support\
**Created:** [January 1, 2023, 2:04pm UTC](https://forum.mautic.org/t/updating-anonymous-contacts/26560 "2023-01-01T14:04:20Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ruskibeats](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/ruskibeats/32/7982_2.png) [@ruskibeats](https://forum.mautic.org/u/ruskibeats)\
**Post date:** [January 1, 2023, 2:04pm UTC](https://forum.mautic.org/t/updating-anonymous-contacts/26560/1 "2023-01-01T14:04:20Z")

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**Your software**  
My Mautic version is:  
My PHP version is:  
My Database type and version is:

**Your problem**  
My problem is: How do you update anonymous contacts?  
I would like to take the details from the anonymous contacts (ip address, referrer etc) and update the contact fields. Ideally I want to take the ip address and add it to my ip address field. I want to do this as I update contacts when I get a sale in shopify and use the ip address metadata as a unique identifier (and therefore merge the contacts)

I do this as I can’t seem to find a way for shopify to pass the cookie over in the contact update process via Zapier.

So the overarching question is - how do you update anonymous contacts with, in this case a unique identifier (ip address).

Thank you