You will receive one of these emails when a group has failed to submit a scheduled payment to you by its due deadline. If the payment missed was an interim installment, you’ll receive the message with subject line: “Action required - payment missed for…”. If the payment missed was the final, or only, payment, you’ll receive the message with subject line: “Action optional - final deadline passed for…”.
In these cases we recommend that you extend the deadline so they can still submit the payment during a brief grace period if they are near completion. In doing so, you may also edit the cost of the group if your policies include a penalty for late payment. As a last resort, you can cancel the purchase (if there were no previous installments paid).
If the group fails to make a scheduled payment and has already paid one or more installments, you should refund the previous installment payment(s) in whole or in part per your policies. You will not be able to cancel a purchase that has had installments paid, but the fact the deadline has passed prevents the group from taking any further action
In both of the situations described above, further payments will be blocked unless you edit the purchase to extend the deadline. You can read more about editing purchases in this article.
You can read more about deadlines in this article. Note that Smart Deadlines, as described in that article, will not trigger these notifications when they pass.