> ## Documentation Index
> Fetch the complete documentation index at: https://docs.supertab.co/llms.txt
> Use this file to discover all available pages before exploring further.

# Check for Entitlements, including Prior Entitlements

> Serve content to returning customers

<Note>
  We strongly recommend you interact with the Customer API using Supertab.js
  when building integrations with Supertab.

  [Supertab.js](/supertab.js) deals with authentication, purchase confirmation, and payments for you and ensures that
  customers have the correct user experience.
</Note>

<Steps>
  <Step title="Authenticate your customer">
    Begin an <a href="./authentication">oauth flow</a> to obtain a bearer token for your customer.

    You must have a token for an authenticated customer before checking entitlement status.
  </Step>

  <Step title="Retrieve the current Website">
    Where you have chosen to have Supertab manage entitlements for you you must
    <a href="./endpoints/retrieve-site">retrieve the current Website</a> in order to determine which
    `content_key` applies for entitlement checks.
  </Step>

  <Step title="Retrieve entitlement status">
    With the `content_key` and a customer's bearer token you can check
    <a href="./endpoints/retrieve-entitlement-status">entitlement status</a>.

    The response details what entitlement (if any) the customer has for the provided `content_key`,
    when that entitlement expires and if the entitlement will recur.
  </Step>
</Steps>