A lot of paysites use 1-click up-sales to cams in their members areas (where users don't have to fill out their card info again). Also Media Revenue, and probably others, have a lot of 1-click ads to their other sites in their members area.
It is easy to do it within your own network, since the user's card data is already stored at your IPSP, but it's a lot more work to do it with other sites, because different programs use different billers, banks and IPSPs.
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