code: public function cancel()
      {
          if (!$this->isType(self::CHARGE_ONETIME) && !$this->isType(self::CHARGE_RECURRING)) {
              throw new Exception('Cancel may only be called for single and recurring charges.');
          }
  
          $this->status = self::STATUS_CANCELLED;
          $this->cancelled_on = Carbon::today()->format('Y-m-d');
  
          return $this->save();
      }
docs: Cancels this charge.
  
  @return self