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

Facebook Insights API Conversions are NOT matching Facebook Ads manager Results

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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  1. 0

    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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  2. 0

    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

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