<?php
  if (getenv('REQUEST_METHOD') == 'POST') {
      $postData = file_get_contents("php://input");
      if (!empty($postData)) {
          $decode = json_decode($postData);
          $extracted_data = $decode->D->details;
          foreach ($extracted_data as $extracted_data_info) {
              echo $phone_number = $extracted_data_info->number;
              echo $status = $extracted_data_info->status;
              echo $track_id = $extracted_data_info->track_id;
              echo $timesent = $extracted_data_info->timesent;
              echo $custom_ref = $extracted_data_info->custom_ref;
          }
      }
  }
?>

{
    "D":{
        "details":[
            {
            "number":"234XXXXXXXXX",
            "status":"DELIVERED",
            "track_id":"xxxxxxxxxx",
            "timesent":"TIME-MESSAGE-WAS-SENT",
            "custom_ref":"xxxxxxxxxx"
            }
        ]
    }
}