Callback on tier toggle in Paywall

I’d love a way to get a callback on the tier toggle in the Paywalls to know which tier was currently selected and when it changed. We use the paywall footer with our own custom content behind it, so a callback would be valuable to be able to display content that reflects the current tier selection. Any idea if this is something the RC team is considering or planning in a future Paywall 2.0 update? Thanks, -O^O-