Tera Wallet add money issue

My store default currency USD. When someone add money to their wallet in BDT (UddoktaPay) they don’t receive their real value. Note: If someone confirm their payment vai UddoktaPay order will automatically complete. one more issue if someone order in BDT or other currencies,, like Mr x order a product 10 BDT or in other currencies, if I refund the order 10 BDT he will received 10$. UddoktaPay : https://uddoktapay.readme.io/reference/api-information
Sandbox transaction Id & number (use random one its doesn’t matter). Before you start please turn on maintenance mode from settings> LightStart
Thanks