| Clue | Source | Date |
|---|---|---|
| Matured, in a way | New York Times | 25 Jul 2021 |
| Reached maturity | New York Times | 24 Nov 2019 |
| Reached maturity | ||
| Needed to be paid | Thomas Joseph | 16 Dec 2016 |
| Needed to be paid | ||
| Required payment | ||
| Had to be paid | ||
| Had to be paid, say | ||
| Reached the point where payment was required |