Ask HN: SaaS to sell physical subscriptions online?

Hi!

I'm starting a physical subscription service and I need a SaaS to manage that. I'm using WordPress for the main website so content management is not a requirement.

Is there a company that:

1. Integrates with PayPal 2. Allows the user to register and update custom defined fields 3. Charge recurring payments every month 4. Let me know of new sign-ups/cancel

I looked into WordPress plugins, but they are all expensive and too much for my needs. I want something zero friction. Is there such a thing?

Thanks!