curl --request GET \
  --url https://api.salesbricks.com/api/v2/plans/{plan_id} \
  --header 'X-SALESBRICKS-KEY: <api-key>'

{
  "plan_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "plan_name": "<string>",
  "bricks": [
    {
      "brick_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "brick_name": "<string>",
      "brick_type": "SUBSCRIPTION"
    }
  ]
}