curl --request POST \
  --url https://api.example.com/api/Messages/Sms/CreditCheck \
  --header 'Content-Type: application/json' \
  --data '
[
  {
    "subject": "<string>",
    "body": "<string>",
    "jobId": 123,
    "placementId": 123,
    "changeRequestId": 123,
    "recipientEntityId": 1,
    "recipientRecordId": 123
  }
]
'

{
  "creditBalance": 123,
  "creditsNeeded": 123,
  "statusMessage": "<string>"
}