curl --request POST \
  --url https://api.halth.com/v1/businesses/{businessId}/billing/subscriptions \
  --header 'Content-Type: application/json' \
  --data '
{
  "confirmationTokenId": "ctoken_1Sq0GFCWwNwrbV0x5GJvufPv"
}
'

{
  "id": "<string>",
  "type": "usage_based",
  "createdAt": "2023-11-07T05:31:56Z",
  "defaultPaymentMethod": {
    "id": "<string>",
    "brand": "<string>",
    "last4": "<string>",
    "customerId": "<string>"
  }
}