Using tokens payement instead of normal ways

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Does anyone have source code for a payment system using tokens after customers buy the tokens? and why some would use such a system ? I plan to write one but I don't know where to start with it and the idea I got comes from here : at the end of the last page

https://wikileaks.org/spyfiles/files/0/ ... PLOITS.pdf" onclick="window.open(this.href);return false;

also how to make the customers use an interactive search engine that crawls a db and open the product if only the customer paid for it ? What I mean here is , not that I don't know how to make that but I want an example of source code of such things to be able to organize my ideas and plans because I never made a big "commerce" website like that