PayPal Express Checkout - how to set currency to USD?

[khoking]

I have managed to installed PayPal Express Checkout on my store. My store is based in Malaysia and I use default currency MYR (Malaysia Ringgit) in my store.

 

I do have USD currency and other currency at my store.

 

However, at my PayPal account, I have set to accept only USD currency. This create error message when a customer is using MYR or other currency at my store and tried to checkout using PayPal express checkout:

 

This recipient does not accept payments denominated in MYR. Please contact the seller and ask him to update his payment receiving preferences to accept this currency.

 

My question:

How can I set in PayPal express checkout to send USD information automatically to PayPal when a customer click the Paypal ECO Button?

 

On my normal PayPal payment method, regardless of what currency my customer use in my store, when checkout using PayPal, automatically at PayPal page it will show USD currency equivalent as what I have set in my store.

 

You can check my store at: http://shashinki.com/shop

 

(It is a live store, please don't make order)