API : want to use it on my website . -- 2

want to use an website api tool on my website Their API Offering products by dollar i want to offer these products on my website after change its price in 4 currency user side : 1- user select the game 2- user select the server or other things 3- user enter the amount of game value he want to buy 4- user click submit to know the price 5- price table which offer the price of game value which the user chose it admin side : 1- edit the value of conver currency ( to convert the $ to egyptian pound ) 2- edit the discount value ( 0-9 $ , 10-19$ , 20-29$ , 30-39$ , 40-49$ , 50$-... ) 3- chose which game appear and which not