user_data variable undefined Tagmanager webserver

[danielawde9]

Hello,

I set up the FB conversion API with google tag manager and it worked just fine, my only issue is that the user_data is not sending from the tag manager web server to the server, what seems to be the issue?

[koconnor3]

I can't debug your personal implementation, but user_data works with this template. Check out @sahava's excellent article detailing how to set this up, it includes user_data: https://www.simoahava.com/analytics/facebook-conversions-api-gtm-server-side-tagging/

[saurabhghatnekar]

@danielawde9 did you set the first_party_collection flag to true for the GA4 tag?. You must do this to be able to pass the user_data parameters to the Server-Side GTM

ref - https://developers.facebook.com/docs/marketing-api/conversions-api/guides/gtm-server-side