When trying to fetch Facebook insights API for the following action offsite_conversion.fb_pixel_purchase I always get less number than Facebook show on their ad manager, I tried to inspect their network calls and URL structure and I see they're using the same field offsite_conversion.fb_pixel_purchase to show Results I am not sure why the numbers are mis-matching. I tried to query from the Graph API and from my shell with the same results.
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2 Answers
You may check use_account_attribution_setting and use_unified_attribution_setting in here: https://developers.facebook.com/docs/marketing-api/reference/ad-campaign-group/insights
Setting use_unified_attribution_setting to true worked for me.
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Simon_Weaver
That worked for me. But what does this even mean in layman’s terms? And why is the default like this?
I did some testing and found out that if you use an additional breakdown, FB will return less conversions. There might be a bug in their API when you use breakdowns.
I tried getting offsite_conversion.fb_pixel_purchase with 'breakdowns' => 'hourly_stats_aggregated_by_advertiser_time_zone', and facebook retuned 5 conversions.
if I remove the breakdown and get the data grouped daily I get 11 conversions which is what Facebook Ads Manager shows