We're not sure what you're asking.
1. Are you asking if LimeLM supports PayPal or bank transfers as part of paying for LimeLM? If so, these questions are answered (https://wyday.com/limelm/signup/ -- PayPal: no, never, Bank transfers: yes, Credit/Debit cards: yes)
2. Are you asking about how to do subscriptions to selling your software? If so, it depends on the payment method you want to use. We don't have examples showing how to collect subscription payments (but there are literally thousands of examples out there).
Long story short: use an existing example out there and the web API to update the product key: https://wyday.com/limelm/help/license-features/#change-datetime-handle-expired