How can I make Q&A Plugin to show answers when users pay for it?

I have installed this plugin on my multisite website. Here is what I am trying to achieve: Registered members should be able to post their questions and answers (and upload long answers as word/xls). They should be able to set a price for each answer. Other non-registered and registered users should be able to view this answer only when they pay X amount for it. How do I implement split paypay payment into this plugin?

Thank you.