---
title: "Optimizing Meta and Google for paying customers, not trials | Cometly Academy"
description: "If Meta is optimizing on trial signups, it will faithfully deliver more trials — many of which never pay. The unlock is pushing the New Customer (first paid) event back to Meta and Google through Cometly’s Conversion API and switching the campaign objective. The algorithm starts hunting for buyers immediately."
source: "https://www.cometly.com/academy/optimizing-meta-google-for-paying-customers"
---

# Optimizing Meta and Google for paying customers, not trials

Same ad spend, dramatically different customer mix.

- Module 03: Product-Led Growth Reports
- Lesson: 3.5
- Track: PLG
- Format: Strategy
- Read time: 6 min

If Meta is optimizing on trial signups, it will faithfully deliver more trials — many of which never pay. The unlock is pushing the New Customer (first paid) event back to Meta and Google through Cometly’s Conversion API and switching the campaign objective. The algorithm starts hunting for buyers immediately.

## Key takeaways

- Push New Customer events to Meta, Google, LinkedIn, TikTok, and Bing simultaneously
- Wait for at least 50 New Customer events per week before switching the optimization event
- Pair the New Customer optimization event with a value parameter to enable ROAS bidding
- Expect CPL and trial volume to drop and paying-customer volume to rise — that’s the goal
- Keep the trial event live as a secondary signal for retargeting and lookalike audiences

The single biggest paid-acquisition unlock for PLG SaaS is switching Meta and Google’s optimization event from Trial Started to New Customer. The same ad spend produces a dramatically different customer mix once the platforms are hunting for paying users instead of free signups.

## Why it matters

The platforms’ algorithms are extremely effective at finding more of whatever you tell them is success. When that’s 'free trial signup,' they find users who love free things — including users who will never pay. When it’s 'New Customer with $X value,' they find users who buy.

## Volume threshold

Meta and Google both need at least 50 conversions per week to optimize reliably on a deeper-funnel event. If your weekly New Customer volume is below that, optimize on the closest deeper event you do have volume for (often Trial Converted) and use New Customer as a secondary signal.

Pair the New Customer event with a value parameter — typically the first month’s MRR or expected LTV — so the platform can run value-based bidding instead of pure conversion bidding.

- Above 50 weekly New Customers → optimize on New Customer with value bidding
- 20–50 weekly Trial Converted → optimize on Trial Converted, push New Customer for retargeting
- Below 20 weekly Trial Converted → optimize on Trial Started, push deeper events for audience enrichment

## Expected patterns

When you switch the optimization event from Trial Started to New Customer, expect cost-per-trial to roughly double and trial volume to drop 30–60%. That’s the algorithm doing its job — finding higher-intent users.

The number that should improve is cost-per-customer or LTV ROAS. If you don’t see improvement in 6–8 weeks, the issue is usually creative-audience fit, not the optimization event.

## Common pitfalls

### Switching events without enough volume

Below 50 weekly conversions the algorithm can’t learn. Stay on the higher-volume event.

### Cutting the trial event entirely

Keep the trial event live as a secondary signal for retargeting and lookalikes. Just don’t optimize on it.

### Not sending value with the New Customer event

Without a value parameter, the platforms can’t do value-based bidding. Always pass first-month MRR or expected LTV.