Question 5218 in Facebook API Question posted in
The official documentation for the Facebook APIs can be found here.

Send GA4 items to FB CAPI

I’m attempting to implement Facebook’s conversion API utilizing a server-side Google Tag Manager container and Facebook’s own CAPI tag template for Google Tag Manager per this setup: https://www.simoahava.com/analytics/facebook-conversions-api-gtm-server-side-tagging/

However, I can’t seem to pass the items and/or their ‘content_ids’ to through this setup. I can’t tell if it is actually misconfigured on my end or if it just looks that way. I suspect the problem has to do with the name I’m giving to the field on the client-side tag configuration.

On the client-side Google Tag Manager tag, what is the appropriate field name to send an array of items in such a way that the Facebook CAPI Tag Template on the server-side Google Tag Manager will correctly interpret it? I’ve tried ‘x-fb-cd-contents’ while sending along ‘items’ from the GA4 ‘ecommerce’ dataLayer event.

This yields the error:
{"error":{"message":"Invalid parameter","type":"OAuthException","code":100,"error_subcode":2804019,"is_transient":false,"error_user_title":"Server-side API parameter error","error_user_msg":"The parameter $['data'][0]['custom_data']['contents'] must be anarray.","fbtrace_id":"A6tk1uzA_nLCrbno_HEjJdN"}}

Of course, this is formatted as an array which leads me to believe I have the field name wrong so the FB Tag Template isn’t interpreting the array correctly. I’ve tried ‘items’ which allows the server-side tag to fire correctly but the server-side preview shows no ‘items’ data and the outgoing POST request shows ‘contents:null’ additionally the test view on Facebook shows no content data coming through via the server.

Or am I totally off and my problem lies elsewhere?

Facebook Test Event
client-side tag configuration

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2

Answers


  1. 0

    Did you try to use Stape.io server FB tag https://github.com/stape-io/facebook-tag that does the "EE items -> FB contents" transformation automatically? Look like this should help in your situation.

    In any way according to the tag code that you use, ‘x-fb-cd-contents’ is the correct name for the items parameter. Look like an issue in the transformation of EE items to FB content and that’s why I recommended using the Stapes tag as it uses a little bit different transformation approach.

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  2. 0

    Create a Javascript variable with the following code:

    <script>
function(){
    return JSON.stringify({{ecommerce.items}});
}
</script>

    Then use that variable instead of ecommerce.items.

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