Buy Button - Custom Amount

[Phillip_Aubrey]

I need users to be able to input the $ amount they would like to spend. Think of the app as a donation app. I would like for users to input how much they would like to donate, instead of me having a fixed amount. What are some work-arounds to do this?

[Jeff_Hager]

Donation button

Is it possible to set up the buy button so the customer select what they want to pay? I am creating a donation app and I would love to let my clients to donate however much they feel like. Thanks