Get plan by ID

curl --request GET \
  --url https://api.sulu.sh/v0/plans/{id} \
  --header 'Authorization: Bearer <token>'

{
  "id": "<string>",
  "object": "plan",
  "name": "<string>",
  "invoiceDisplayName": "<string>",
  "description": "<string>",
  "billingInterval": "<string>",
  "currency": "<string>",
  "merchantId": "<string>",
  "productId": "<string>",
  "tax": {},
  "prices": [
    {
      "id": "<string>",
      "object": "price",
      "billableMetricId": "<string>",
      "model": "standard",
      "invoiceDisplayName": "<string>",
      "properties": {
        "unitPrice": "<string>"
      },
      "createdAt": "2023-11-07T05:31:56Z",
      "updatedAt": "2023-11-07T05:31:56Z",
      "deletedAt": "2023-11-07T05:31:56Z"
    }
  ],
  "createdAt": "2023-11-07T05:31:56Z",
  "updatedAt": "2023-11-07T05:31:56Z",
  "deletedAt": "2023-11-07T05:31:56Z"
}