I think it would be really nice to make it so usrs could spend the given amounts, and add one or two more- maybe three?
With the current trends being
80 Chicken Dollars US$5
180 Chicken Dollars US$10
380 Chicken Dollars US$20
I could see some options like
880 Chicken Dollars US$50
1480 Chicken Dollars US$75
2280 Chicken Dollars US$100
Obviously my math is not to be quoted or exact, and if this violates tos I am happy to remove it.
I would personally love to be able to spend a flat amount when I put into this game, I tend to spend about 50$ at a time and it would make times easier.
Adding some native features to allow users from groogle play or apple play to pay would be great too!