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All the routers, switches (actually – pretty much each and every device which forms Internet infrastructure) – are allowed to drop each and every packet.

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TCP, when it observes a dropped packet, interprets it as an indication of congestion – and slows down.

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Fortunately, there is a neat crypto-trick which makes this schema usable for Server-oriented games in general - and multi-player games in particular

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if you’re using TCP to communicate, you should log everything right before it goes into your send() call (and right after it comes out of your recv() call

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With the Direct Processing, customer should trust us (the merchant) with their details

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On the other hand, most of PCI DSS requirements make perfect sense regardless of formal compliance

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Chargeback monster will come from under the bed and will eat all your hard-earned money!

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it is trivial to develop a system with guaranteed zero chargeback rate – to achieve this, it is sufficient to decline each and every transaction at pre-filter stage