So I'm developing a website with subscription plans using PayPal as payment gateway. I've this scenario when a user can select extra options with each plan, and from what I gathered reading the developing docs there's no way to add extra charges while creating or subscribing a user to a plan. Please note that these charges for extras will be monthly/Yearly as well.
Any help would be appreciated.
When you want to charge a particular combination of things, create a plan for it. Store this plan in your database for later re-use if the same combination is selected.