Facebook Messenger has a timeout period that does not allow sending a message after 24-hour messaging window. This timeout period started from the last incoming message from a contact.
However, Facebook Messenger allows sending a message beyond the timeout if the message is sent with a Message Tag.
The following are the tags available on the platform:
Confirmed Event Update Send reminders or updates for an event they have registered for (e.g., RSVP'ed, purchased tickets). This tag may be used for upcoming events and events in progress.
Post-Purchase Update Notify an update on a recent purchase (e.g. Notifying customers on the shipping information after item is shipped out)
Account Update Notify a non-recurring change to their application or account. (e.g. The account has been approved)
Step 1: Press Send Tagged Message From the messaging bar, press on the Send Tagged Message to send a message
Step 2: Select an appropriate Message Tag Based on your message content, select a message tag that best describes the content.
Step 3: Input the message text Type in the message you will like to send to the contact. Alternatively, you can use snippets too by typing "/" in the field.
Step 4: Send the tagged message Review the details and press the blue SEND button.
The message bubble will then appear in the Message History with the timestamp, tag used and the user who sent it.