digifi-mware/app/Controllers/DigiCallBack.php

<?php

namespace App\Controllers;

class DigiCallBack extends BaseController
{
  public function cardAccount(){
      $raw_json = file_get_contents('php://input');
      $in = json_decode($raw_json, true);
      $out =[];

      $inKeys = array_keys($in);
        foreach ($inKeys as $item){
                    log_message('critical', "DigiCallBack:: item **  ${item}  ---- ---- ". serialize( $in[$item]) );
            if (is_array($in[$item])){
                foreach (array_keys($in[$item]) as $item1){
                    log_message('critical', "     == item1 **  ${item1} ---- ". serialize( $in[$item][$item1]) );
                    if (is_array($in[$item][$item1])){
                        $arr2 = $in[$item][$item1];
                        foreach (array_keys($arr2) as $item2){
                            log_message('critical', "     == item1 **  ${item2} ---- ". serialize($arr2[$item2]) );
                        }
                    }
                }
            }
        }

//        $arr = array(1, 2, 3, 4);
//foreach ($arr as &$value) {
//    $value = $value * 2;
//}

      return  []; //json_encode( $final_out );
  }

}