Fix Paypal module problem on Magento store

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Job Description

We added English site localization in Magento 1.6.2 web store and plan to ship goods worldwide. Main issue to we need to resolve now - fix Paypal Standard method to place orders paid by Paypal.

I tried to use Paypal account which now used in old Magento 1.4 installation - Paypal payment method doesn't appear at all while checkout. Tried to use Paypal Express - it show error

"PayPal gateway has rejected request. Currency is not supported (#10605: Transaction refused because of an invalid argument. See additional error messages for details). A match of the Shipping Address City, State, and Postal Code failed (#10736: Shipping Address Invalid City State Postal Code). Internal Error (#10001: Transaction failed due to internal error)."

while clicking on "Check out with Paypal button".

We need to resolve this issue.