It is super easy to set up. First, log in as admin, and go in Setting.
Go to the Finances tab, and make sure the Tool used for subscriptions is LemonSqueezy.
Go in https://app.lemonsqueezy.com/products and define your pricing plans.
Click on share, and copy the URL
That URL is the one that you need to put in your Pricing Plan.
In WebHooks → https://app.lemonsqueezy.com/settings/webhooks enter the webhook for your project.
<aside> 🌐 https://yoursite.com/webhook/subscription/lemonsqueezy
</aside>
You will also need to set a webhook secret
This is a string that you can think of, but needs to be the same in both places..
You can set this in Settings→Apps & plugins → LemonSqueezy Subscribe →secret
Video of the Plugin Development