# Webhook

Webhook is one of the alarm distribution methods in B3.

A webhook is an automated, event-driven way for one application to send real-time data to another via an HTTP POST request to a unique URL. Instead of an application constantly asking for updates ([polling](https://www.google.com/search?sca_esv=8e23599b05dcda53\&sxsrf=AE3TifM-Yi3NXiOuynYZsb7zoiP9wyZ08g%3A1756135073041\&q=polling\&sa=X\&ved=2ahUKEwj2-NL5oKaPAxUWQvEDHWtyNl8QxccNegQIDxAB\&mstk=AUtExfCEDorqor_LPMRaumB_qIsYjR-nxzqIg5w3WxUvm_POV0d9TaWNVHjfoQyt34WHUoMpRWnRjtfM0Imab3Y_Kk4EcEEpzNQDqj95stWCuWtF-Gs2U_r-WA6AQWko7inYBg4zNjxE-G4Do2IC4d6LcDTa9JkdvvXRdk0b5mreE2OHKGXB0u6B_s43cmwjhZJwMdzbjkeq4MMgmM8Iow2pG6F40ms_5a_wDp5Iq7jWY-Evo92gbyiqIs-GaropPTd_hK_wg9lKKRtGX1FGDgB_A3vB\&csui=3)), a webhook allows the source application, which in our case is B3, to "push" information to a destination application the moment a specific event occurs. This event in case of B3 is a detection of an active alarm.

At present, webhooks are used to distribute alarms via SMS using B3 SMS devices described in [T-SMS Device Installation Manual](https://help.boomerang3.com/b3-sms-device-installation-manual/).

To create a webhook:

1. Click "+" button in the Webhooks part of the Alarm Group details form that you can open by [Edit Alarm group](/boomerang-3-domain-administrator-manual/admin/alarms/alarm__alarm_groups/edit-alarm-group.md).

<figure><img src="/files/IHuFGLrI3TkEwuUxINNt" alt=""><figcaption></figcaption></figure>

2. A webhook form is opened.

<figure><img src="/files/fFSrhn0kDPsMZSCZUF98" alt="" width="458"><figcaption></figcaption></figure>

3. Enter webhook name, API Unique ID, Payload URL, mark "Include user phone numbers" and "Active".

<figure><img src="/files/w8xVxnswHUCejHCRgIfS" alt=""><figcaption></figcaption></figure>

Click the icon after Webhooks form title to check the JSON-payload format.

<figure><img src="/files/7isedSQVzK9zWsj2EVcl" alt=""><figcaption></figcaption></figure>

&#x20;The form fields are described in the table below.

<table><thead><tr><th width="164">Field</th><th width="253">Description</th><th>Default value</th></tr></thead><tbody><tr><td>Name</td><td>Webhook name.</td><td>No default value, must be unique.</td></tr><tr><td>API Unique ID</td><td>Defines the B3 SMS device which shall send the SMS.</td><td>No default value, must be unique. The same string is entered into the B3 SMS device as described in <a data-mention href="/spaces/sp4j9Tn2xGb8D5438KRm">/spaces/sp4j9Tn2xGb8D5438KRm</a></td></tr><tr><td>Payload URL</td><td>Points to API that receives the webhook POST. A fixed URL pointing to B3 SMS server.</td><td><a href="http://10.50.33.12/api/b3.asp">http://10.50.33.12/api/b3.asp</a></td></tr><tr><td>Signature Secret</td><td>Signature Secret. A fixed value.</td><td>icujira2025</td></tr><tr><td>Include user phone numbers</td><td>If checked then the POST contains user mobile phone number.</td><td>Must be checked.</td></tr><tr><td>Include user emails</td><td>If checked then the POST contains user emails.</td><td>Not checked in case of webhook used for B3 SMS devices. Planned for future use.</td></tr><tr><td>Active</td><td>A checkbox that enables a given webhook.</td><td>Must be checked for the webhook to work.</td></tr></tbody></table>

4. Click "Save" and sign.

Multiple webhooks can be defined in an alarm group.&#x20;

<figure><img src="/files/72d25aAQnWKksfkDqEVS" alt=""><figcaption></figcaption></figure>

The icon on the left shows if the webhook is active. In the example above Designgården is not active and DGC1 is active.

The number of POSTs distributed by a given webhook is also shown.

The check mark shows the status of the last POST. At the end of each webhook row there are "Edit" and "Delete" icons.


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