Fbc and fbp as event parameters - minor issue

Facebook Conversion API
1

Thanks for providing the CAPI tag for sGTM. I’ve used it for several customers, and it’s a pleasure to work with.

For $BORING_REASONS, I need to send the fbc and fbp as event parameters from GTM to sGTM. I checked the template, and the template handles that case:

if (!fbc) fbc = eventData._fbc;
if (!fbp) fbp = eventData._fbp;

Unfortunately, event parameters cannot begin with underscores (_). See here

If you set a parameter in GTM to start with an _, it doesn’t get sent to sGTM.

I got around the problem by sending the values in another parameter and doing a transform to add the _fbc, _fpb to the eventData in sGTM.

Thought you’d like the heads up.

2

You can send these parameters to event data with any name and just overwrite them in the FB tag, user data section:

Screenshot 2024-05-20 at 13.12.54
Screenshot 2024-05-20 at 13.12.541800×490 24.6 KB

Often use not GA4 but another transport mechanism like Data tag -and then there is no such problem with variable names.

3

I didn’t think of using the tag option - appreciate your response.