iOS 14.5 attribution loss was patched wrong or not patched at all
The Meta Conversions API is how you recover purchase data lost after Apple's App Tracking Transparency changes. Most US brands either haven't implemented it, implemented it poorly, or have event deduplication errors where the same purchase fires via both browser pixel and CAPI — inflating conversion counts and corrupting the signal. Meta's algorithm is making decisions based on data that is either incomplete or double-counted.