It is supper easy to setup. First, login as admin, and go in Setting. Go in the Finances tab, and make sure Tool used for subscriptions is Paddle.
Go in https://vendors.paddle.com/products-v2 and define your pricing plans.
As admin, when you create the plan, you will have the option to set Paddle Plan id.

In Paddle Developer - WebHooks set the following web-hook to receive subscription notification
<aside> 🌐 https://yoursite.com/paddlebilling
</aside>
You will also need to set the Paddle Billing Token
You can set this in Settings→Apps & plugins → Paddle Billing Subscribe →Token
Paddle Token can be found in your Paddle Developer Tools -> Authentication → Client Side token
https://vendors.paddle.com/authentication-v2
Make sure you have entered default payment link - link to your website
