Title: I hope this is not the wrong place to post this.<p>I have been trying to learn about credit card payment gateways and I am not finding the proper resources. Specifically -  
* I read (on HN) sometime ago that there is a specific way the card numbers are issued by companies and that you could tell by the number which company issued it. Where do I get this information? 
* What exactly do the different players do in the ecosystem? We have the providers (Visa, MC), issuers (Citibank), payment gateways, processors.
* When I swipe my card at Best Buy what happens after the card is read?<p>Could someone please point me in the right direction?
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