import Finch from '@tryfinch/finch-api';

const client = new Finch({
  accessToken: 'My Access Token',
});

const payGroup = await client.payroll.payGroups.retrieve('pay_group_id', {
  entity_ids: ['550e8400-e29b-41d4-a716-446655440000'],
});

console.log(payGroup.id);

{
  "id": "5d0b10a1-a09a-430f-81f1-20be735dc5e9",
  "name": "Monthly",
  "pay_frequencies": [
    "monthly"
  ],
  "individual_ids": [
    "be7b048c-a6f3-4194-a017-2f537d4f3565"
  ]
}