How to Use One-Time Notifications (OTNs) on Messenger

10 min read

With over 1 billion people using Messenger monthly, it remains a go-to spot for turning followers into buyers. Meta’s 24-hour messaging rule makes it tricky to keep conversations going without your page getting flagged (or worse, suspended).

One-time notifications (OTNs) are one of the few ways to safely “break” the 24-hour rule; they work by obtaining permission from the user to message them about a specific topic (such as back-in-stock alerts, flash sales, or ticket drops).

OTNs are extremely effective at converting — the person has already expressed interest in whatever you’re offering; all you have to do is get the info in their inbox.

Below, we’ll explain how to get opt-ins for OTNs and when to use them (plus a whole lot more).

What Is a One-Time Notification (OTN)?

A One-Time Notification (OTN) is a type of Messenger message that allows you to reach subscribers outside of Meta’s standard 24-hour messaging window — but only if they’ve requested it.

Meta rolled out OTNs in 2020, following the tightening of Messenger’s rules on how businesses could communicate with customers.

The idea was to strike a balance: Businesses needed a way to follow up on time-sensitive requests, while users needed protection from endless, unwanted messages. The OTN API provided brands with a compliant way to send those valuable “just-in-time” alerts without violating policy.

Here’s how it works:

You ask a customer if they want to get notified about something specific (e.g., “Notify me when tickets go on sale”).
If they click “Notify Me,” Meta gives you a token for that subscriber and topic.
You can then use that token to send one follow-up message outside the 24-hour window.

Why use OTNs? 🤔

Messenger is still widely used in the APAC region (especially the Philippines and Vietnam), the United States, and parts of Europe, especially by local businesses and e-commerce brands. Without OTNs, they’d be cut off from high-intent customers after 24 hours.

Can Manychat send OTNs?

Yes. Manychat fully supports Messenger’s One-Time Notifications. When someone opts in, Manychat saves that permission, allowing you to send a follow-up message outside the 24-hour window — entirely within Meta’s rules.

OTN vs. Recurring Notifications

While OTNs are all about one-time, high-value alerts, Meta later introduced Recurring Notifications (RNs) in 2022 for ongoing engagement.

Here’s the quick breakdown:

OTNs: One follow-up message per opt-in. Great for time-sensitive use cases like product restocks, flash sales, or event reminders.
RNs: Customer agrees to a daily, weekly, or monthly update — perfect for drip campaigns or recurring offers.

Think of OTNs as the one-off “don’t miss this update” tool, while Recurring Notifications are your “let’s stay in touch regularly” option.

Together, they give you the flexibility to keep Messenger messaging both compliant and engaging.

Meta’s Rules for OTNs

The whole point of One-Time Notifications is to protect Messenger as a trusted channel, not a spam factory (delicious).

Here’s what you need to know:

No deception. You can’t bait people with one promise and then send them something else. If you say “We’ll notify you when your item is back in stock,” that’s exactly what the message must do.

No incentives for signing up. You can’t offer discounts, prizes, or freebies in exchange for clicking the “Notify Me” button. The opt-in must be based on genuine interest.

Only one message block per OTN. Once you send the notification, that OTN is used up.

The message must deliver exactly what was promised. If the subscriber opted in for a webinar reminder, don’t turn it into a sales pitch. Stick to the expectation you set.

Subscribers must click the “Notify Me” button themselves. Consent is everything. Automating or pre-checking opt-ins is not allowed.

FYI: Manychat’s Messenger setup is designed to keep you compliant automatically. If a subscriber falls outside Meta’s 24-hour rule or you attempt to exceed the single-block OTN limit, the platform will not allow the message to be sent.

Meta has designed this process very specifically. You can’t just type “Hey, want me to remind you?” and call it consent. Here’s how it actually works:

You must trigger an OTN Request via Messenger’s official “Notify Me” button.
- This is a pre-set button provided by Meta. The text on the button cannot be customized.
- When a user taps it, Meta issues a one-time token tied to your Page and that user.
You cannot pre-check or auto-enroll users.
- Each person must individually click the button themselves. No bulk imports, no assumed consent.
The OTN request must clearly state what they’re signing up for.
- Example: “Click below and we’ll notify you once the product is back in stock.”
Once approved, you can send exactly one message outside the 24-hour rule.
- The token is used the moment you send the message.
- If you want to notify them again, you must collect another OTN consent.

For Manychat users: In Manychat, you don’t need to juggle tokens yourself. Just create a Messenger List with “One-Time Notification” as the frequency, drop the request into your flow, and you’re set.

Think Outside The Inbox: 5 Ways to Use OTNs

One-Time Notifications work for nearly any business that wants to send timely, permission-based messages.

Here are some ways to put them into action:

Keep drip sequences flowing

Running a multi-day fitness challenge, onboarding series, or content drip? With OTNs, you don’t have to stop at Messenger’s 24-hour mark. Instead, you can keep the sequence alive. Each time your subscriber opts in, you get the green light to send the next piece — whether that’s tomorrow’s workout, the next lesson, or fresh content.

Product drops and back-in-stock alerts

Launch day hype? Restock frenzy? OTNs make sure your most eager fans never miss out. Whether you’re dropping a new product or bringing back a sold-out favorite, let shoppers raise their hand to get notified. That way, the moment your shelves are ready, they will be too.

Event reminders (tickets, webinars, reservations)

A little nudge goes a long way. OTNs allow you to remind people when it really counts, like before tickets drop, a webinar starts, or a table opens up. From “Your seat is saved!” to “Your table’s ready,” you can turn sign-ups into actual show-ups.

Coupons and promo delivery

Instead of blasting discounts into the void, let customers opt in for the deals they care about. For instance, a restaurant can say, “Want to know when your favorite dish is on special?”

Exclusive and limited-time offers

Nothing sparks FOMO like a limited-time offer. OTNs let you deliver that “act now” vibe, whether you’re promoting early-bird tickets, a surprise pop-up, a flash sale, or a limited drop.

Pair OTNs with SMS and Email for Maximum Conversions

OTNs are great for re-engaging subscribers exactly when they’ve asked for it, but they don’t have to work solo.

Layering OTNs with SMS and email communications ensures critical messages cut through, especially considering that not everyone checks Messenger around the clock.

Here’s how it plays out:

A shopper opts in for a Messenger OTN when a product is back in stock.
You send the notification the moment it’s ready.
If they don’t click within a set time, you follow up with an SMS or email.

Note: Like OTNs, SMS marketing requires explicit opt-ins. Messenger permission does not apply to SMS, so be sure customers subscribe separately and can easily opt out.

Need help getting those emails? Pick up some tips: The Instagram Creator’s Guide to Collecting Emails

Send it (With Permission)

One-Time Notifications may be small in name, but they pack a big punch. They give you a safe, compliant way to stay in touch beyond Meta’s 24-hour window, and because subscribers choose to hear from you, every message lands with high intent.

Layer them with SMS or email, and you’ve got a multi-channel strategy that keeps your brand top of mind — without spamming or risking your account.

Ready to try it? Fire off your first OTN in Manychat today, and relax knowing every message stays 100% compliant. 😎

✋ Frequently Asked Questions (FAQs)

1. Do I need to collect a new opt-in every time?

Yes. Each OTN token is good for one message only. Once you send it, that token is “spent.” If you want to message someone again, you’ll need them to click “Notify Me” again.

2. Can I sweeten the deal by offering a discount for opting in?

Nope. Meta doesn’t allow incentives for OTN sign-ups. The opt-in must be based on genuine interest. That said, you can deliver promos or discounts within the OTN message itself, as long as that’s what you promised.

3. What happens if I try to send outside the rules?

If you send a message outside of the 24-hour window without the appropriate tag, here’s what’ll happen:

The message won’t be delivered. Meta actively enforces its policies through Messenger’s API, so most non-compliant messages are blocked automatically.
Your Page could be flagged. Repeated violations may trigger warnings, restrictions, or limits on your Page’s ability to send messages.
You risk getting suspended. In more serious or repeated cases, Meta can restrict or even remove your ability to use Messenger as a business communication channel.

Good news: Manychat won’t let you break the 24-hour rule. If a subscriber is outside the 24-hour window or your OTN token has already been used, our platform will block the send. That way, you stay safe and don’t risk getting your account flagged by Meta.

For more information on the 24-hour rule, watch this video.

4. Can I send the same OTN to a big group all at once?

Yes, but only if everyone in that group has clicked the “Notify Me” button for that exact topic. Meta requires individual consent per subscriber, so you can’t bulk-assign or pre-check the box for them.

5. Should I use OTNs or Recurring Notifications?

It depends on the job:

Use OTNs for one-off, high-intent alerts (restocks, ticket drops, event reminders).
Use RNs for ongoing updates (weekly drip, daily challenges, monthly offers).
Most creators use a mix — OTNs for urgency, RNs for nurturing.

6. How do I make sure people actually click “Notify Me”?

Keep the ask simple, clear, and tied to real value. Instead of “Want updates?” try “Tap below to get first dibs when tickets drop.” The more specific the benefit, the higher your opt-in rate.