curl --request POST \
  --url https://api.sakari.io/v1/accounts/{accountId}/checkout \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "plan": "<string>",
  "commitment": 123,
  "frequency": "<string>",
  "name": "<string>",
  "email": "<string>",
  "address": {
    "line1": "<string>",
    "line2": "<string>",
    "city": "<string>",
    "state": "<string>",
    "postalCode": "<string>"
  },
  "tax": {
    "type": "<string>",
    "id": "<string>"
  },
  "segmentUnderstanding": true
}
'

{
  "success": true,
  "data": "<string>"
}