import Hercules from '@usehercules/sdk';

const client = new Hercules({
  apiVersion: '2025-12-09',
  apiKey: process.env['HERCULES_API_KEY'], // This is the default and can be omitted
});

const response = await client.beta.subscriptions.check({
  customer_id: 'customer_id',
  entitlement_key: 'entitlement_key',
});

console.log(response.entitlement_id);

{
  "has_entitlement": true,
  "key": "<string>",
  "entitlement_id": "<string>"
}