Written by Toby Awalt

February 21, 2020

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Facebook acknowledges that existing Message Tags don’t apply to every situation where Messenger communications are useful to your subscribers. To cover this gap, they introduced the One-time Notification (OTN), which will allow you to send messages to subscribers beyond 24 hours as long as they give you explicit permission.

Here’s Facebook’s example of a useful OTN Situation:

Facebook's Example of the one-time use feature

Like Message Tags, One-Time Notifications do have some specific rules:

  • No Deception – The message that you send using an OTN must match what a user agreed to receive.
  • No Incentives – You can’t give subscribers something of monetary value or equivalent in return for signing up to receive an additional message. However, the message they sign up to receive can be valuable, IE a notification when a specific item goes on sale.

Violating either of the above or receiving a high volume of negative user feedback will result in losing access to the OTN API, meaning you’ll lose the ability to use OTNs in the future.

Implementing One-Time Notifications from Start to Send

Follow these three steps to get started with OTNs, get access, request an OTN permission from subscribers, and then begin sending your OTN messages.

Applying For One-Time Notification Access

To begin using One-Time Notifications, you’ll need to request permission to access it in your page settings under “Advanced Messaging.”


In most cases, OTN permission will be granted instantaneously.

Requesting A One-Time Notification permission From Subscribers

Once you’ve gained access to One-Time Notifications, you’ll see a new message block option appear in Flow Builder called “OTNR” (it stands for One-Time Notification Request).


After selecting the “OTNR” message block, you will be asked to select or create an OTN Topic. Creating an OTN Topic is just as easy as building a new custom field, tag, or conversion event. Note that the OTN Topic name won’t be sent to Facebook, so it doesn’t need to perfectly match the content – feel free to use whatever naming conventions work for you.

When building the OTNR block, you will be able to customize the main text, but Facebook Messenger restricts us from updating the text on the button. It will always say “Notify Me”. It will also be rendered in the subscriber’s language in the Messenger thread.

Once you have your topic set, add your new OTN Request to your flow wherever it’s appropriate. Some scenarios in which an OTN can be useful include:

  • When a subscriber requests an item that is out of stock
  • When a subscriber wants an update about an upcoming event (when tickets go on sale for example)
  • When a subscriber indicates they’re interested in a future sale, promotion, or sweepstake
  • When a subscriber wants to receive a specific piece of content that isn’t ready for distribution yet
  • To extend drip sequences that have longer than 24-hour delays between each message. If your subscribers keep agreeing to the next part of the sequence, you can keep sending

Sending A One-Time Notification

Using an OTN to send a message works similar to adding a message tag. On the first message of a flow, select a One-Time Notification Topic as the Content Type.


This will bring up a list of your existing OTN topics. Select the one that corresponds to the message that you want to send

Once applied, the OTN works like any other message tag: It allows you to send the message outside of the 24-hour window (to subscribers who have opted in). Consider one important caveat, though: you may only send a single message block when using an OTN. To send any additional messages, a user must interact with your first message.

So make sure that your OTN message:

  1. Delivers the content that a subscriber requested in the first message
  2. Offers a compelling reason to interact with your brand and open up the 24-hour window

More Details About One-Time Notifications

Beyond the how-to, there are a few other useful things to know about OTNs.

Accumulating One-Time Notifications

While one-time notifications can only be used once (as the name might imply), you can accumulate multiple OTNs for a single subscriber. The catch is that each one must be requested separately. So if you have five different things you want to send a subscriber, they’ll need to agree to each one individually.

The same is true if you want to remind a subscriber about the same topic on multiple occasions — they will need to agree to each reminder. For example, if a subscriber wants to receive a reminder about an upcoming sale one day before and one hour before, each of those notifications must be agreed to separately (but both could use the same OTN Topic inside of ManyChat).

Important note: Be careful with sending too many OTN requests in a row for a single subscriber within a short period of time. Such messenger chat bot behavior is monitored by Facebook and considered to be an abuse of OTN. If Facebook algorithms detect abnormal amounts of OTN requests sent within a short period of time you’re at risk of losing access to the OTN feature.

One-Time Notification Content

The message that you send using an OTN is limited to a single content block, but the type of content that you send is not limited. That means you can send over text, an image, card, gallery, video, audio, or file.

Inside the 24-Hour Window

ManyChat will automatically default to standard messaging for subscribers who are inside of the 24-hour window. That means if someone grants you an OTN, but receives that message within 24 hours of their last interaction, you’ll still keep the OTN for future use.

Previewing An OTN Flow

When you preview a flow that uses an OTN using ManyChat “Preview” feature, it will not actually use the OTN. Instead it will be sent as a regular text block with the button. We made this to avoid problems with Facebook’s OTN abuse monitoring in situations of extensive Flow testing when you naturally might send numerous OTNs to yourself within a short timeframe.

More to Remember for the March 4th Facebook Update

Now that you have all the information you need to begin using One-Time Notifications, there’s plenty of other steps to take to get your Chat Marketing strategy ready for the coming update. Learn more about Message Tags, Sponsored Messages, and SMS + Email on ManyChat in our Guide to Facebook Messenger’s 2020 Changes.

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The contents of this blog were independently prepared and are for informational purposes only. The opinions expressed are those of the author and do not necessarily reflect the views of ManyChat or any other party. Individual results may vary.