Best option for getting user entitlements on web

I have a mobile app ready to go using RevenueCat, I want to hook up a web equivalent of checkout.

I can see a guide on how to connect stripe, but purchasing isn’t the only thing RevenueCat is concerned with, what about getting user entitlements?

I can do something like:

const res = await fetch(
  `https://api.revenuecat.com/v1/subscribers/${user.id}`,
  {
    headers: {
      'Authorization': `Bearer ${'appl_x'}`,
      'Content-Type': `application/json`,
      'X-Platform': 'ios',
      'accept': 'application/json',
    },
  },
)
  .then((res) => res.json())
  .then((res) => {
    const entitlements: Record<string, PurchasesEntitlementInfo> =
      {}
    if (res?.subscriber?.entitlements) {
      Object.keys(res.subscriber.entitlements).map((v: string) => {
        const value = res.subscriber.entitlements[v]
        const activeSubscription =
          res.subscriber.subscriptions?.[value.product_identifier]
        entitlements[v] = {
          expirationDate: value.expires_date,
          isActive: new Date(value.expires_date) >= new Date(),
          latestPurchaseDate: value.purchase_date,
          willRenew: !activeSubscription?.unsubscribe_detected_at,
          productIdentifier: value.product_identifier,
        } as any
      })
    }
    return { data: { all: entitlements } }
  })

but this seems kind of crazy, is there some form of web SDK I’m missing?