The Conversion API Setup That Actually Moved Our ROAS
The two critical events
Purchase and AddToCart. Get these server-side first. Everything else is nice-to-have.
First-party data
Hash and send email, phone, and city. Match quality goes from mediocre to strong and conversion count spikes.
Validate daily for 2 weeks
Event Match Quality in Events Manager should be 7+/10. Lower means something's off with your hashing or implementation.