We are pleased to announce the release of our new version of the Alipay Cross Border for WooCommerce plugin.
It fixes, amongst other things, the following errors and supports WooCommerce 2.1:
1) ‘Payment error: Bad “currency” parameter’
2) ‘Bad “total_fee” parameter’
You can purchase it from here: https://www.woothemes.com/products/alipay-cross-border-payment-gateway/
Or, update your version to 1.4.0 via WooThemes.