Shopify/active_merchant — pull request #578 by dougal (2013-02-11 15:26:39+00:00)
Title: Worldpay: XML encoding is required to be ISO-8859-1 for proper parsing o...

Worldpay: XML encoding is required to be ISO-8859-1 for proper parsing of non-Latin characters.

- Confirmed in practice and by Worldpay Engineers on their support line.