Is there a service like Shopify for SaaS products?

Shopify offers everything I need to sell physical goods, but I'd like to sell a piece of software I wrote as a subscription. Based on experience and a cursory google search, it seems like Shopify isn't a great choice for SaaS products. On top of the website/marketing/payment/analytics services Shopify provides, I'd love to get subscriptions, cohort analytics, API docs hosting, signup/cancel webhooks, and an endpoint to query a customer's subscription level.

I realize that I could bundle together a few services to get these features, but it would be nice if they were all in one place. Do you know of any products that could do this? Thanks!