curl --request GET \
  --url https://demo1-api.payrollintegrationsdemo.com/v1/plans/{plan} \
  --header 'Authorization: Bearer <token>'

{
  "id": "550e8400-e29b-41d4-a716-446655440000",
  "displayName": "Example 401(k) Plan",
  "tpes": [
    {
      "tpeId": "660e8400-e29b-41d4-a716-446655440001",
      "planIdentifier": "PLAN-12345"
    }
  ],
  "createdAt": "2024-01-15T10:30:00Z",
  "updatedAt": "2024-01-20T14:45:00Z"
}