I have hosting, but it's static hosting only- no server-side apps on the backend, it's with Fastmail & it comes with my email service, so I want to use that for

I have hosting, but it's static hosting only- no server-side apps on the backend, it's with Fastmail & it comes with my email service, so I want to use that for the site. It limits me to a static only site, but I'm okay with that. I like Ribbon for payment processing https://www.ribbon.co https://www.ribbon.co because it works on any website, especially my static site. It's expensive, but the user experience it provides is worth it to me, I like that there aren't any hoops for customers to jump through to check out, its as simple as I'd like my own checkout experience to be. To me that's high-end & matches the image I have for the company to project. I'll look into both Mailchimp & Aweber & see which I like. Thanks again for all the valuable info. I appreciate that you've taken the time to post such a detailed reply for me.