# Invoice Web Hook

{% hint style="info" %}
For foundational information on webhooks, including key concepts and verification methods, please refer to the [Webhook Basics](https://docs.inqud.com/developer/web-hooks) page.
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Invoice Web Hooks enable merchant systems to receive timely notifications regarding status changes of invoices.

Learn more about invoices:

{% content-ref url="../../explore/invoice" %}
[invoice](https://docs.inqud.com/crypto-recurring/explore/invoice)
{% endcontent-ref %}

### Prerequisites <a href="#prerequisites" id="prerequisites"></a>

* Your business account with Inqud is set up.
* The Crypto Recurring Project has been established and configured within the Inqud platform.

### Setting up Web Hook <a href="#setting-up-web-hook" id="setting-up-web-hook"></a>

* Open the app and sign in.
* From the left menu bar, choose "Recurring".
* Select the desired project.
* Locate the "Invoice webhook" option and click on "Edit".
* Enter the required details:
  * Webhook link: Provide the URL of your webserver that will handle the webhooks.
  * Webhook secret: Enter a secret key for signature calculation (optional).
* Click on "Save" to finalize your settings.

### Notification

The Invoice Web Hook activates with every transition in invoice status. It requires your web server to respond with a 200 status code. If a different status code is returned, the Web Hook will attempt retries multiple times, using an exponential back-off strategy.

For detailed request specifications, please refer to the following page:

[Invoice Webhook Specification](https://apireference.inqud.com/#tag/crypto-recurring-webhooks/operation/user_crypto-recurring_create-webhook) (see **Callbacks** sections)