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.

passbyme

PassBy[ME] use two-factor authentication with the highest known security standard, which is PKI. Rather than relying on a password authentication, which can be phished or guessed, PassBy[ME] second factor service adds a second layer of security to your WordPress accounts. It protects your website from hacks and unauthorized login attempts.
PassBy[ME] is easy to setup and use. You do not need software installation, just sign up for PassBy[ME] service and install the plugin.
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PassBy[ME] Two-Factor Authentication

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Webhook Signature add-on for Gravity Forms vs PassBy[ME] Two-Factor Authentication