Facebook pixel Missing Purchase Value Parameter

Technical Q&A

Topic summary

Multiple Shopify store owners are experiencing persistent Facebook Pixel errors showing “Missing AddToCart Value Parameter” and “Missing Purchase Value Parameter” in Facebook Events Manager.

Core Problem:

  • The errors cause inaccurate conversion reporting in Facebook Ads Manager
  • Reported values either show absurdly high numbers that don’t match actual sales, or display $0 for legitimate purchases
  • The issue has been occurring for several months across numerous stores

Attempted Solutions:

  • Original poster contacted both Shopify and Facebook support with no resolution
  • One user (@Shop_Lovers) offered to help multiple people privately but no public solution was shared
  • One participant (@TomashMartiny) reported the issue resolved itself after 2+ months, suggesting it may have been a platform-level bug

Current Status:

  • The discussion remains unresolved with 30+ users reporting identical problems
  • No verified fix has been publicly documented
  • Participants continue requesting help, with some mentioning the errors affect multiple client stores
  • The thread includes screenshots showing the specific error messages in Facebook Events Manager
Summarized with AI on November 1. AI used: claude-sonnet-4-5-20250929.
3

@Shop_Lovers I sent you a DM with the store, thanks