curl --request GET \
  --url http://localhost:8000/api/v1/subscriptions/plans/{plan_id}/modules \
  --header 'Authorization: Bearer <token>'

[
  {
    "id": 123,
    "subscription_plan_id": 123,
    "plan_module_id": 123,
    "date_added": "2023-11-07T05:31:56Z"
  }
]