Ahhhh, I was.wondering why they would take the time to set up an API with that data and forgot that almost everything has a way to just dump things into it without needing to be set. I forget because where I work we actively avoid that approach because of risks like this.
Micropayments would scale at a ridiculous rate like microtransactions in games have, so your $20 example would be at least $200 in reality by now.