What are issues in SSL setup for Multi-site and Paypal chained payments

Hi there, this question is in reference to the post I made on: https://premium.wpmudev.org/forums/topic/how-to-set-up-ssl?replies=15#post-599873

Does anyone know if anything changes using Paypal Chained Payments? I am taking a transaction fee and not charging monthly. Please let me know if anyone has experience with multi-site (having multiple stores) Domainname.com/STORENAME and checking out. Does the SSL change? Am I able to checkout with both Paypal and credit card?

Thanks in advance!