To enable the highest accuracy tracking of your Snapchat Ads, follow this guide on how to place the ThoughtMetric tracking parameters on your Snapchat Ads.
ThoughtMetric Snapchat Ads tracking parameter:
&tmsrc=snapchatad&tmcid={{campaign.id}}&tmsid={{adSet.id}}&tmid={{ad.id}}
1.) Copy the ThoughtMetric Tracking Parameter
For all new ads created going forward:
2.) Select Business > Ad Accounts from the top-left menu in the Snapchat Ads Manager.
3.) For each account, click on it, and then in the left sidebar, click URL Parameters.
4.) Then click Add URL Parameters.