Brady said that you’re the expert with billing. I work with EDI and trading partners. Below are documents containing information about the new release on x12-7030 standards. (they are for public review and not the final product).
Also I’m including an open-source program that has been good to me. Giving credit to, “Bots Open Source Edi Translator”. It includes translating edi files from xml to x12 or x12 to xml. Great thing too, they support standards like EDIFACT and TRADACOMS, which would be helpful for international transaction.