Stop Authorize.net card-testing attacks
Card testers love any WooCommerce store running Authorize.net, because each attempt tells them whether a stolen card is live. The transaction fees and failed-payment ratio add up fast, and your merchant account pays for it. QWeb Spam Shield stops the burst at the checkout.
Works with Authorize.Net
What card testing costs you on Authorize.net
Every attempt can carry a gateway or transaction fee, and a sudden run of declines is a red flag to your acquiring bank. AVS and CVV filters reject the bad cards, but the attempts still hit your account and still cost you. The fix is to stop the run before it reaches the gateway.
How Spam Shield protects your checkout
- Velocity and burst detection stops one source firing many checkout attempts in a short window.
- Reputation and behaviour checks at the order stage catch known-bad IPs and disposable emails.
- Real customers protected, with genuine retries flagged for review rather than blocked.
- Lower failed-payment ratio, which is what keeps your merchant account healthy.
Keep your merchant account healthy
Authorize.net and your acquiring bank watch your decline and dispute rates. Cutting off card-testing bursts keeps those numbers low and your account in good standing.
Common questions
No, it works in front of them. Spam Shield stops the abusive burst at your checkout so far fewer attempts reach Authorize.net at all.
No. A real shopper retrying a card is flagged for review, not rejected. Only single-source bot bursts are hard-stopped.
No. Checkout protection works on activation for any WooCommerce gateway, including Authorize.net.
The same protection applies. There are dedicated guides for Stripe and PayPal as well.
More ways Spam Shield protects your site
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QWeb Spam Shield protects forms, comments, registrations and WooCommerce. 7-day free trial, no card charged until day 8.