people uses the donation sum buttons in the banner form. Also, a lot of people choose lower sums if they want to donate periodically. Therefore, changing the donation sums once they click an intervall might be some kind of help in picking an amount.
Please create a banner that changes the proposed donation sums in the buttons once you click an interval.
The default will be einmalig (I guess the einmalig buttons needs to be filled out per default).
The seven specific donation sums for the four intervals with be provided by Fundraising