Multiple currency error in Paypal sandbox

[drwes]

I am integrating Paypal checkout Api in my php site. But every time the order is failing and its showing multiple currency error.The payment scenario is as follows: \[code\]Seller a/c is USD\[/code\]\[code\]Buyer can pay in 3 currencies GBP, EUR, USD\[/code\]Every time when a buyer visits the site, my app detects their country and initialize PAYPAY with the relevant Currency.Please suggest some solution