Selling Rise course via a business website

Hello,

I'm building a course in Articulate Rise for a client who is a coach and wants to sell his course via his website. I have hosted the course using AWS and linked it via Cloudberry. The course is now accessible via his Squarespace website (which we've made private for now). We are experimenting with Memberspace to set up customer payment and login to the course via his website, but Memberspace is not really made for these purposes and we've hit a couple of snags. 

Has anyone done this before? Or can anyone recommend how to provide support to my client in terms of him selling his course online and making it available to his clients via a payment/login gateway in his website?

Thank you!