Hi Dixcy
Have you also searched for previous membership questions and answers on this forum?
You may get some insights and answers on those threads 
For example, Sitejet member Zachery says: I have built a full membership site on SiteJet with Memberstack!
Also refining your question to: “How do associations with 10,000+ members integrate digital membership cards with their CRM, website, payment system, and member portal?” could reveal more cases studies rather than generic marketing pages info.
Also what will you be doing with your exploration findings?