"I don't see that point. Every time I order something from Amazon, I receive an order confirmation complete with the amount charged to my debit or credit card. They also drop a note when my items are shipped. Is this different from Germany?"
When you place the order, do you know for certain what the actual product is and how much it will cost you BEFORE the order is actually placed? That's the bit that doesn't happen with a dash-button and is illegal under German law.