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 planEntitlement = await client.beta.subscriptions.plans.entitlements.attach('plan_id', {
  entitlement: 'entitlement',
});

console.log(planEntitlement.id);

{
  "id": "<string>",
  "entitlement": {
    "id": "<string>",
    "name": "<string>",
    "key": "<string>",
    "active": true,
    "livemode": true
  }
}