Yes you can pass the currency to paypal. You use currency_code. You can not use encrypted or hosted buttons.
Below is how to create an encrypted or unencrypted button:
1. Login to your PayPal account.
2. Click Merchant Services tab at the top of the page.
3. Click the type of button you want. Example: Buy Now, Add to Cart, Donate, Subscribe
4. Enter your information to customize the button to your needs.
5. Click Step 2 Ensure "Save button at PayPal" is not checked
6. Step 3 for additional features.
7. Click "Create Button."
8. You can click Remove code protection/Protect code to add or remove button encryption as you need.
9. Click "Select Code" to select the button code.
10. Copy and paste the button code into your own web page code.
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