> For the complete documentation index, see [llms.txt](https://docs.sprinthub.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.sprinthub.com/en/topics/relate/message-templates-meta/maximum-support-time/24h-window-whatsapp-api.md).

# 24h window - WhatsApp API

<figure><img src="https://684109703-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F9FzUKkagBNy5uQ7AtGNa%2Fuploads%2FVObgVvFoBLv7Brz3pFWK%2FDALL%C2%B7E%202025-03-01%2009.49.49%20-%20A%20digital%20illustration%20representing%20the%20_24-hour%20window_%20of%20the%20WhatsApp%20API.%20The%20image%20features%20a%20large%20digital%20clock%20displaying%20_24h_%20at%20the%20center%20.webp?alt=media&amp;token=dd7f3b64-110c-4169-9ba1-074e079fac4c" alt=""><figcaption></figcaption></figure>

The WhatsApp Business API is an essential tool for companies that want to communicate with their customers in an automated, efficient way and in line with the guidelines established by Meta. One of the main concepts within this ecosystem is the **24-hour window**, which directly impacts how and when you can interact with your leads.

### What Is the WhatsApp API 24h Window?

The **24-hour window** is a period during which a company can reply for free to a lead or customer who has sent a message. This period starts counting from the lead's last message sent.

If the 24-hour window expires, you cannot send free-form messages directly to the lead. To reopen the conversation, you need to send a **message template** approved by WhatsApp.

### How to Send Messages Within the 24h Window?

There are three main ways to engage a customer within the permitted period:

1. **The customer starts the conversation**: If a lead contacts you via WhatsApp, you can reply within the 24-hour window at no additional cost.
2. **The customer interacts with an ad**: If the lead clicks on a WhatsApp ad and starts the conversation, you can also reply freely within that period.
3. **Sending messages during the active window**: Any reply within the deadline does not generate additional charges.

### What Happens When the 24h Window Expires?

If a customer does not send messages within 24 hours of the last interaction, the conversation is blocked for regular messages. From that point on, you can only contact the lead using **message templates** approved by WhatsApp.

#### How to Reopen the 24h Window

To resume contact after the window closes, you can send a **message template**. This template can be an alert, notification, or a reminder related to the service. However, it is important to note that this sending has a cost, usually charged in cents of a dollar.

The template must be previously approved by Meta and can include relevant information to re-engage the customer, such as:

* Exclusive promotions
* Payment reminders
* Support notifications
* Appointment confirmations

As soon as the customer responds to the template, the 24-hour window is reopened, allowing you to continue the conversation normally.

### Difference Between Message Templates and Free Conversations

* **Free conversations**: Whenever a customer initiates contact or interacts with an ad, you can reply at no cost within the 24h window.
* **Paid message templates**: If you need to resume a conversation after 24 hours, you must send a template, which has an additional cost.

### Practical Example and Image Context

The images presented show real interaction scenarios on a customer service platform that uses the WhatsApp API. Here are some depicted situations:

**24h Window Expiration Warning**:

* The service card shows alerts that the 24h window is about to expire, indicating that the agent must respond quickly or end the service.

<figure><img src="https://684109703-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F9FzUKkagBNy5uQ7AtGNa%2Fuploads%2Fwy10nljjYsHF55xE8aWC%2Fimage.png?alt=media&amp;token=79ed0c9a-9900-4461-b7b4-8b04fc41f4d2" alt=""><figcaption></figcaption></figure>

* If the time runs out, the platform displays a warning informing that contact with the customer can only be resumed by sending a message template.

<figure><img src="https://684109703-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F9FzUKkagBNy5uQ7AtGNa%2Fuploads%2F4YeyINTE4IIxGFDzOYMQ%2Fimage.png?alt=media&amp;token=f6a7198f-f78a-49b7-b1c0-dfeca45d6352" alt=""><figcaption></figcaption></figure>

**Sending Message Templates**:

* The image below shows the moment when the agent can choose a message template to reopen the 24h window and resume the conversation with the lead.

<figure><img src="https://684109703-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F9FzUKkagBNy5uQ7AtGNa%2Fuploads%2F9rakZ7mxWxwIabkdOavE%2Fimage.png?alt=media&amp;token=d802074f-9bd3-491f-8a9f-7de82209955a" alt=""><figcaption></figcaption></figure>

* These templates are pre-approved and categorized, ensuring that communication complies with WhatsApp guidelines.

<figure><img src="https://684109703-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F9FzUKkagBNy5uQ7AtGNa%2Fuploads%2FBhLDGpuuKyhOMm85Wnu9%2Fimage.png?alt=media&amp;token=24044850-7d23-424c-bc2e-f07c56e7a9b6" alt=""><figcaption></figcaption></figure>

**Closing the Service**:

* If the service has already passed 24 hours, there are notifications that instruct the agent to close inactive conversations whose response deadline has already been exceeded.
* This ensures that the team can focus on new contacts and active interactions.

<figure><img src="https://684109703-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F9FzUKkagBNy5uQ7AtGNa%2Fuploads%2FTddpNKkn9JJuf1lXFkjc%2Fimage.png?alt=media&amp;token=ec1fbcec-2d68-41be-839e-54a9e7407f39" alt=""><figcaption></figcaption></figure>

### Best Practices for Optimizing Interactions on the WhatsApp API

1. **Respond quickly**: The faster the interaction, the greater the chance of conversion at no additional cost.
2. **Use templates strategically**: Send relevant messages to re-engage leads without seeming invasive.
3. **Automate responses**: Use chatbots to ensure immediate service within the 24-hour window.
4. **Take advantage of interactive ads**: Invest in WhatsApp ads to start conversations without template sending costs.

### Conclusion

Understanding how the WhatsApp API 24h window works is essential to maximize your sales and optimize communication costs. Use replies within the window whenever possible and, when necessary, make smart use of templates to maintain effective contact with your leads.

Take advantage of this tool to enhance your customer service and ensure a more efficient sales flow!