Invoice Generator for Appsumo Purchases

I can only speak for Germany but it's a pain to modify the appsumo invoice template with VAT and the products manually each time after a purchase. There some mandatory things like my VAT and the tax amount / percentage missing on the original AS Invoices for the german tax offices and for other countries for sure, too. I think many customers would be glad to get this done automatically and it would be an really nice extension for your Appsumo OSG Sheet Template. The script should import/save the Appsumo invoices data also, allow to write some configurable texts and batch print pdf invoices, named with Appsumo, Date and amount of the purchase.