Help to change currency code in G2A PAY module

Hello guys

I've a little issue

I want the currecny to be converted automatically to USD during checkout process

for example ....

The currency in checkout is: SAR

when I click confirm order ......... a new checkout from g2pay will show ( here I need the currency to be automatically in USD instead of SAR

got the idea ??

so, in my opinion ... there will be some changes in module files for ( currency_code )

Did anyone did that before or someone could help me ?

any help ?