The documentation says to post an object like. If I want to send to the entire list, how do I define the column to use to get the phone number from?
{
  "sendDate": "2019-08-24T14:15:22Z",
  "method": "Invite",
  "surveyId": "string",
  "name": "string",
  "recipients": {
    "mailingListId": "string",
    "contactId": "string",
    "sampleId": "string",
    "transactionBatchId": "string",
    "transactionId": "string"
  },
  "message": {
    "messageId": "string",
    "libraryId": "string",
    "messageText": "string"
  },
  "parentDistributionId": "string"
}