# Tracking Code or Rest API: How to create new users in mautic? How to get mautic contact id from tracking? **URL:** \ **Category:** Product Support\ **Created:** [May 11, 2021, 4:38am UTC](https://forum.mautic.org/t/tracking-code-or-rest-api-how-to-create-new-users-in-mautic-how-to-get-mautic-contact-id-from-tracking/19411 "2021-05-11T04:38:48Z")\ **Posts on this page:** 1\ **Showing post:** 5
**Author:** ![joeyk](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/joeyk/32/11164_2.png) [@joeyk](https://forum.mautic.org/u/joeyk)\ **Post date:** [May 11, 2021, 8:54am UTC](https://forum.mautic.org/t/tracking-code-or-rest-api-how-to-create-new-users-in-mautic-how-to-get-mautic-contact-id-from-tracking/19411/5 "2021-05-11T08:54:54Z")
You should check this Forum thread to be aware of the limitations: > [@Tracking Code & Shopify Not Matching up to Contacts](https://forum.mautic.org/t/tracking-code-shopify-not-matching-up-to-contacts/16465): > > Your software My Mautic version is: 2.16.3 My PHP version is: 7.2 Your problem My problem is: We have installed the tracking code on Shopify and enabled on Mautic side: Identify visitor by tracking url Identify visitor by device fingerprint Identify visitors by IP The problem is that we are able to track all visitors however it is not connecting them to the contacts. I signed in as a user, see that I am signed in, however I do not see any Events under my contact. Any pointers on how t… --- _[View the full topic](https://forum.mautic.org/t/tracking-code-or-rest-api-how-to-create-new-users-in-mautic-how-to-get-mautic-contact-id-from-tracking/19411)._