What does a website need in order to support payment methods?

I am making an online casino and I would like my site to support all popular payment systems that allow payments processing in online gambling industry. Among the most widely known payment systems such companies as Netteller, Firepay, PrepaidATM, Moneybookers, E-gold, Webmoney, Ecocard and a dozen of others. What do I need? I will greatly appreciate a detailed answer.

first, you’ll need an https connection with your client, but thats all i know sorry

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