Most major gateways now require 3D Secure (3DS v2) for any transaction where the card is not physically present and the billing address zip code fails AVS. Since carders rarely have accurate AVS data, these transactions now prompt a challenge (fingerprint or OTP), making automated checking impossible.
to create custom scripts that would "charge" or "authorize" a card to verify its status. checker refers to one of two scenarios: Gateway Fixes : Payment gateways like have implemented advanced fraud detection (like Akamai Security cc checker with sk key patched