curl --request POST \
  --url https://api.otpiq.com/api/whatsapp/campaigns/{_id}/sample \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "recipients": [
    {
      "phoneNumber": "9647712345678",
      "templateParameters": {
        "body": {},
        "header": {},
        "buttons": {}
      }
    }
  ]
}
'

{
  "success": true,
  "data": {
    "_id": "<string>",
    "campaignId": "<string>",
    "name": "<string>",
    "template": "<string>",
    "phoneNumber": "<string>",
    "scheduledFor": "2023-11-07T05:31:56Z",
    "startedAt": "2023-11-07T05:31:56Z",
    "completedAt": "2023-11-07T05:31:56Z",
    "totalRecipients": 123,
    "sentCount": 123,
    "deliveredCount": 123,
    "failedCount": 123,
    "estimatedTotalCost": 123,
    "reservedAmount": 123,
    "reconciledAmount": 123,
    "isSampleCampaign": true,
    "sampleOfCampaign": "<string>",
    "createdAt": "2023-11-07T05:31:56Z",
    "updatedAt": "2023-11-07T05:31:56Z"
  }
}