Billing issues
A billing issue is a renewal that failed because the payment didn't go through, often because a card expired.
Also called Billing retry, Grace period, Involuntary churn.
In plain words
3 renewals failed to pay this week; 2 were recovered.
How Apparent would say it about Fern, an example app in the live demo.
Good to know
People who hit a billing issue didn't choose to leave. Both stores keep trying the payment for a while; Apple keeps retrying for up to 60 days.
You can switch on a grace period in App Store Connect and the Play Console, so people keep access while the store retries. More payments recover when people aren't locked out.
A gentle message in your app asking people to update their payment details recovers more of them.
Where the number comes from
RevenueCat, or the stores' server notifications.