curl --request GET \
  --url https://api.example.com/api/v1/plans/{plan_id} \
  --header 'x-api-key: <x-api-key>'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "name": "<string>",
  "amount": 123,
  "currency": "<string>",
  "interval": "<string>",
  "interval_count": 123,
  "trial_period_days": 123,
  "is_active": true,
  "created_at": "2023-11-07T05:31:56Z"
}