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PHP

Rate Limit the Store API Against Card Testing

Turns on WooCommerce's built-in rate limiting for the Store API used by the block cart and checkout, slowing down bots that test stolen cards.

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Code

add_filter( 'woocommerce_store_api_rate_limit_options', function ( $options ) {
    return array_merge( (array) $options, array(
        'enabled'       => true,
        'proxy_support' => false, // True behind Cloudflare or a load balancer.
        'limit'         => 25,    // Requests allowed...
        'seconds'       => 10,    // ...per this many seconds.
    ) );
} );

Notes

Allows 25 requests per 10 seconds per visitor; set 'proxy_support' to true only behind a proxy or CDN that passes the visitor IP.

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