I know there are a lot of threads on merchants but i have a technical question.

Which of the merchants available (paysystems, 2 checkout etc..) allow me to pass a price and currency etc.. onto there secure payment page rather than have a list of set items.

I have a hosting maker script which makes "on the fly" custom pricing and would like to link all this to my payment processor. Therefore i need to be able to just send a load of variables ot the payment page and not use a load of preset links.

Im with hostcharge right now who only allow you to have preset items with preset prices, and seriously think i may have to change to accomodate my new needs.

2checkout can do this through the shopping cart routine. Real merchant accounts that use authorize.net can also handle this using a https post comand.