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bh-wc-checkout-rate-limiter
Prevent card-attack fraud on WooCommerce stores by rate-limiting the "place order" button
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bh-wc-csp-condition-ip-address
Use customer IP address as input for WooCommerce Conditional Shipping and Payments
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I’d bet they’re behind a VPN and are requesting a new IP adapter each transaction. I’ve written an add-on to WooCommerce Conditional Shipping and Payments that checks is the IP on a VPN then allows hiding a payment gateway if they are. I’m on mobile now but I can upload it to GitHub if that’s a route you want to take. (It’s a few commits ahead of: https://github.com/BrianHenryIE/bh-wc-csp-condition-ip-address ).