May 14, 2025: that’s when Meta’s Offline Conversions API stops working. If your WooCommerce store uploads phone orders, processes manual CSV conversions, or uses any legacy offline tracking integration—your data stops flowing to Meta after this date. Most store owners don’t know this deadline exists. Here’s what you need to do now.

The Deprecation Nobody’s Talking About#

Meta quietly deprecated the Offline Conversions API in favor of the unified Conversions API (CAPI). The migration deadline? May 14, 2025—no extensions.

This isn’t a minor API update. Meta completely restructured how offline conversions work. The old system with separate Offline Datasets? Gone. Manual CSV uploads to a dedicated offline endpoint? Deprecated. Everything now flows through a single, unified Conversions API.

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Here’s the problem: most WooCommerce store owners using Meta ads don’t realize they’re affected. If you set up offline conversion tracking years ago through an older integration or manual uploads, your setup will silently break after May 2025.

What Changed: The Unified CAPI Approach#

Meta combined online and offline conversions into one system. No more separate Offline Dataset configuration—everything goes through CAPI now.

The changes:

• Old approach: Pixel for website events + separate Offline Conversions API for phone orders, CSV uploads, in-store purchases
• New approach: Single Conversions API handles both online and offline events

This simplification has real benefits. Brands that have fully implemented CAPI report a 15-20% increase in campaign performance and ad efficiency (Calibrate Analytics, 2025). The unified approach means better data matching, more complete attribution, and improved optimization signals.

But there’s a catch.

Why AI Tools Are Making This Worse#

Here’s an unexpected problem: AI assistants are giving dangerous advice. As ConversionTracking.io warns, “The biggest problem this causes is that ChatGPT, Claude and others will provide outdated information that only applies to the old Offline Conversions API.”

If you ask an AI tool how to set up offline conversions for Meta, you might get instructions for the deprecated system. Follow those instructions, and you’re building something that stops working in months.

Always verify against Meta’s current documentation—the Conversions API documentation at developers.facebook.com, not generic guides that may reference the old system.

Are You Affected? How to Check#

You’re affected if any of these apply:

• Manual CSV uploads: You’ve uploaded spreadsheets of phone orders or offline purchases to Meta
• Offline Event Sets: You have Offline Event Sets configured in Events Manager
• Legacy integrations: You use older apps or plugins that connect to Meta’s Offline API
• In-store tracking: You send point-of-sale data to Meta for attribution
• Phone order tracking: You manually log phone sales and upload them to Meta

Check your Meta Events Manager. Look for “Offline Events” or “Offline Event Sets.” If you see them, you need to migrate.

What Happens After May 14, 2025#

If you don’t migrate, your offline conversion data simply stops. No error messages in your WooCommerce dashboard. No notifications in Meta. Your phone orders, manual uploads, and offline events just… disappear from your attribution.

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Your Meta campaigns will optimize on incomplete data. ROAS calculations will be wrong. Attribution will miss conversions. And you might not realize it until you wonder why your “best performing” campaigns aren’t actually driving sales.

The Migration Path for WooCommerce Stores#

The good news: Meta’s unified CAPI approach is simpler than the old system. No separate offline datasets to configure. Everything goes through the same API endpoint.

For WooCommerce stores, the migration options:

Option 1: Update Your Integration

If you’re using a plugin or service that connected to the old Offline Conversions API, check if they’ve updated to CAPI. Many haven’t. Contact your provider and specifically ask: “Do you support Meta Conversions API for offline events, or are you still using the deprecated Offline Conversions API?”

Option 2: Manual CAPI Implementation

You can send offline events directly to the Conversions API. This requires formatting events according to Meta’s CAPI specifications, handling authentication, and ensuring proper event deduplication with your pixel.

Option 3: Server-Side Tracking Solution

Server-side tracking via CAPI handles both online and offline events through a single integration. Transmute Engine™, for example, implements Meta CAPI natively—online purchase events from WooCommerce and offline event data flow through the same unified pipeline. No separate offline setup needed. No migration required for existing users.

The advantage of server-side: iOS 14.5 ATT and browser restrictions have reduced pixel tracking reliability by over 50%. Server-side CAPI bypasses these limitations while handling both online and offline events in one system.

Key Takeaways#

• Hard deadline: May 14, 2025—Meta’s Offline Conversions API stops working, no extensions
• Unified system: CAPI now handles both online and offline events—no separate Offline Dataset needed
• Check now: Look for Offline Event Sets in your Meta Events Manager
• Beware AI advice: Many tools give outdated instructions for the deprecated system
• Benefits of migration: Brands report 15-20% campaign performance improvement with full CAPI implementation

Don’t wait until May 2025 to find out your tracking is broken. Check your Meta Events Manager today, identify any Offline Event Sets, and start planning your migration to the unified Conversions API.