The app requests that the second (confirmation) notification also have buttons, but the final decision on this is made by the Android system code.
I'm not sure why they have it this way, but that's how it is. Again,the app requests, and Android grants or not.
When the confirmation notification is collapsed, you can expand it either by swiping away some other notification you don't need, or by doing the two-finger "zoom out" pinch gesture on the notification (not very obvious, to say the least, but that's how Android folks decided to do it).
Here is what it should look like, when expanded.