On webhook ping not getting post data

[jagat]

The below code is my webhook funtion in CI PHP . I'm unable to get post data after webhook ping. please help out to get data on webhook so i can integrate the recurring subscription payment successfully . Thank you

}

public function webhook(){
  $original_array=$_POST; 
  $string_version = implode(',', $original_array);
  $dc=array("amount"=> $string_version);
   $insrt = $this->Generalmodel->show_data_id('subscription_recurring','','','insert',$dc);
}