Websorcery

This plugin automatically hides the “Add to Cart” button for WooCommerce products that have no price set (or empty price). Instead, it displays a customizable “Request Price” button that opens a lead capture modal.
Features: 
* Automatic detection of checking empty prices. 
* Lead capture form (Name, Phone). 
* Email notifications. 
* Customizable design via settings. 
* GDPR compliant checkbox. 
* Localization support (i18n).

Websorcery Request Price

Replaces "Add to Cart" with "Request Price" button for lead generation.

danielboven

This plugin can sign the webhook events sent by the Gravity Forms WebHooks Add-On to your endpoints by including a signature in each event’s <code>X-Gform-Signature</code> header. This allows you to verify that the events were sent by the Gravity Forms add-on, not by a third party. As of right now, you must verify the signatures by manually using your own solution. However, an example of a Node.js (JavaScript) implementation is linked below.
Before you can verify signatures, you need to retrieve your endpoint’s public key (more information at <a href="#how%20can%20i%20verify%20the%20signature%3F" rel="nofollow ugc">this question</a>).
This plugin uses the same keys for every form and endpoint, meaning that the same keys will be used for every signature generated.
<h3>Verification implementations</h3>
<ul>
<li>Node.js: See the example on <a href="https://github.com/danielboven/gravity-forms-webhook-signature/blob/main/examples/NODE_JS.md" rel="nofollow ugc">Github</a>.</li>
</ul>

Webhook Signature add-on for Gravity Forms

Add a signature HTTP header to webhook requests to prevent man-in-the-middle and replay attacks.

Websorcery Request Price vs Webhook Signature add-on for Gravity Forms