How implementing the Conversion API reduced CPA by 35%
A focused Google Ads audit produced five quick wins and reduced CPA by 35% for an eCommerce brand.
Table of contents
Problem
How We Fixed It
Results
Client’s Words
Problem
Vertical: E-commerce
Niche: Smartphones (new & refurbished)
Market: Ukraine
Platform: Meta Ads
- Meta Pixel tracked conversions inaccurately due to iOS 14+ privacy restrictions.
- Ads Manager underreported conversions by ~25-40%.
- Meta's algorithm received incomplete data → higher CPA and unstable scaling.
How We Fixed It
- Audited existing pixel and event tracking setup.
- Identified core eCommerce events: ViewContent, AddToCart, InitiateCheckout, Purchase.
- Implemented hybrid Browser + Server-Side tracking via GTM + sGTM.
- Configured Meta Conversion API to send clean event data server-side.
- Set up custom parameters (value, currency, content IDs, transaction ID) to ensure accuracy.
- Tested and validated events using Meta Test Events Tool.
Results
- CPA decreased by ~35% after enabling Conversion API.
- Spend increased by 87% without performance loss.
Before:
After:
Client’s Words
T
Taras
Head of Marketing, Retech
They showed excellent management, transparent communication, and consistently quick delivery of impressive results.
Read review on
Get a Marketing Plan That Helped 300+ Online Businesses Grow Fast
Skip years of trial and error. We’ve already spent $200M+ to figure out what really works.
FAQ
What is the Conversion API and how does it differ from the Meta Pixel?
Why was the Conversion API needed for this project?
How was the Conversion API integrated in this case?
What results were achieved after implementing the Conversion API?
Can Conversion API benefit other eCommerce advertisers?
UKRAINE
Kyiv, Yamska 35, office 12
+38 098 692 68 42PORTUGAL
Cascais, Av. Faial 371A, office 3
+351 922 210 245USA
Chicago, 171 N Aberdeen St Suite 400
+18 888 939 981NORWAY
Oslo, Nerde Slottsgate, 4
+479 228 0348
