All extensions will be approved (or not) by a mod. You will receive a comment with the approval or rejection and the new due date.
If you need an extension on your claim please comment here with the following:
If you need to cancel your claim do so here.
Comment with the following:
You will receive a comment that we've received your cancellation notice. Do not assume your claim has been cancelled just by commenting. Only when you receive confirmation from a mod will your claim truly be cancelled.