thank you all for help
but what if we just add 3 coin as example "etn,xvg,xrp"
and when any user make a deposit , the system automatically convert this coins to btc market price and keep this amount in every user wallet.
until make purchase order.
i think i can do it manually with chat agent, but it will be huge load.
any one can create any system like that, i will be happy to pay for his time