You are spending on Meta install campaigns. Events Manager, your ad reporting and your own database disagree about how many installs you got. Somewhere between the tap and the dashboard, data is being lost, double counted, or attributed to the wrong campaign.
We maintain facebook_app_events, the Flutter plugin over 400 open source projects depend on. We have shipped fixes for Meta's own SDK defaults. We know where this chain breaks.
This is product support for facebook_app_events, the plugin we maintain. It is not how we start client projects; for those, the introduction call is free. The diagnostic exists because attribution problems need an hour of structured work before anyone can say what is wrong.
One hour, 300 USD, credited in full against the audit fee if you go ahead. We look at your Events Manager, your configuration and your event payloads together, and you leave knowing whether you have a configuration problem, an attribution problem, or no problem.
Fixed fee, quoted after the diagnostic call. Scope sets the number: how many platforms, how many event flows, and whether the Conversions API is involved. You get one figure before any work starts, and the 300 USD diagnostic comes off it. No hourly billing.
We also sell commercial support for facebook_app_events: response-time commitments, compatibility patches after a Facebook SDK major, and backports. If that is what you need rather than an audit, email hello@oddbit.id and ask for the support terms.

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