I tried this the other day since amazon.de kept bugging me about it. But what's the point. Like is it cheaper for Amazon than Mastercard? If I pay with my mast

I tried this the other day since amazon.de kept bugging me about it. But what's the point. Like is it cheaper for Amazon than Mastercard? If I pay with my mastercard I get a notification instantly and the money disappears. With SEPA-Lastschrift it takes ages and makes budgeting difficult.