How to retrieve RevenueCat subscription details on my website

I have a multi-platform SaaS (Software as a Service) for iOS, Android, and web.

Purchase Services

Web: Stripe
iOS: Appstore IAP
Android: Google Play IAP

All purchases are connected to RevenueCat.

As far as I can tell, there is no library for web developers to access information, only a REST API.

How are websites checking if a user is a entitled/paying member?

My current plan for implementation is as follows:

1. Get Subscriber via Rest AI
2. Check the resulting object’s `subscriber.entitlements[‘my-entitlement-id’]`
   1. paying/subscribed if exists & if `expires_date` > `current_date` 

Question 1: Is this the best method to achieve this OR is there a web SDK somewhere?

Question 2: How often should I poll for subscription information?

1. Should I hit the database every time they navigate to a new membership page?
2. Should I cache the membership information for a specific amount of time (somehow?)