Paypal or payment subscription capture for first month free products (free trials).
The way WHMCS is set up to create a free trial account the user has to sign up technically 2 times. During the first time we don't capture any payments.
However if we use a coupon to make the first month free (for example for the monthly plan) that is technically a free trial. We want to have the option to be able to capture the paypal information or payment information of the client to subscribe them for the next payment. So during the renewal they don't have to login again and use their paypal.
Our suggestion: To make a "force payment subscription' regardless of type of product so even the product is free for the first month we can get the payment information.