Using Roku billing for donations?

I'm wondering if I can incorporate donations into an app using the Roku billing platform. It seems I should be able to define specific products like "$5 donation", "$10 donation", "$25 donation", etc, and then allow the user to purchase a donation product.

Any reason that this wouldn't work? Only thing I can think of is if a user purchases a donation, they may not be able to purchase the same donation again since they've "already" purchased it.