Your points are valid from the date of travel until 31 December of the following year.
You earn points in February 2023. These points are valid until 31 December 2024.
You earn points in December 2023. These points are valid until 31 December 2024. If you then earn more points in 2024, these new points will expire 31 December 2025.
Once points expire, you can no longer use them to make payment. You can check when your points expire by logging in to your online account.