title: How to pass currency to payment geteway in USD only
body: <p>I am using wordpress + WMPL + WPML Multilangual with default wocommerce currency is USD, Product currency are shown based on visitors location i.e Egypt = EGP, Saudi Arabia = SAR, other countries = USD</p>
  <p>i am using a payment gateway called vapulus which accept payment only in one currency such as USD</p>
  <p>so i need to convert any currencies to USD when passing payment to vapulus gateway</p>