My site is being used to screen credit cards via Shopify Payments / How do I report it and am I charged for credit card declines?

Topic summary

A Shopify store owner is experiencing credit card testing attacks, with approximately 47 failed/abandoned checkouts in 24 hours. All attempts use the same fake name/address but different credit cards, targeting a single product.

Key Concerns:

  • Whether the merchant is charged fees for declined transactions (consensus: no fees for failed payments)
  • How to report the issue to Shopify (difficulty reaching human support)
  • How to stop the attacks from cluttering abandoned checkout data

Suggested Solutions:

  • Temporarily deactivate the targeted product or password-protect the site
  • Use Shopify Flow with Check If or Run Code nodes to block suspicious patterns
  • Install Cart Lock app to add friction for bots
  • Report to IC3.gov (Internet Crime Complaint Center)

Current Status:
The merchant has made the targeted product inactive temporarily and is testing the Cart Lock app. Community members note this is a common problem, with hopes that Shopify’s new fraud detection model (launching September 26) will help. The discussion remains open as the merchant seeks direct Shopify support contact methods.

Summarized with AI on October 24. AI used: claude-sonnet-4-5-20250929.
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