2Checout Currency Converter

I have a problem paying by 2Checkout

in my opencart currencies U.S. dollars and the default currency is Saudi Riyal

for example:

When a customer buys an amount SR 150 and pressed Checkout and choose to pay by 2Checkout and thin moving to 2Checkout site that finds an amount is $150 not SR 150

Note this problem was found in Paypal and i fixit ftomone of the solution you have in Forum
Are there changes in codes or other solution to this problem?

my opencart V 1.5.3

same problem
please we need your help

for 2checkout and paypal stander

my opencart V 1.5.4