App\Ninja\PaymentDrivers\BasePaymentDriver::completeOnsitePurchase PHP Method

    public function completeOnsitePurchase($input = false, $paymentMethod = false)
    {
        $this->input = count($input) ? $input : false;
        $gateway = $this->gateway();
        if ($input) {
            $this->updateClient();
        }
        // load or create token
        if ($this->isGatewayType(GATEWAY_TYPE_TOKEN)) {
            if (!$paymentMethod) {
                $paymentMethod = PaymentMethod::clientId($this->client()->id)->wherePublicId($this->sourceId)->firstOrFail();
            }
            if (!$this->meetsGatewayTypeLimits($paymentMethod->payment_type->gateway_type_id)) {
                // The customer must have hacked the URL
                Session::flash('error', trans('texts.limits_not_met'));
                return redirect()->to('view/' . $this->invitation->invitation_key);
            }
        } else {
            if ($this->shouldCreateToken()) {
                $paymentMethod = $this->createToken();
            }
            if (!$this->meetsGatewayTypeLimits($this->gatewayType)) {
                // The customer must have hacked the URL
                Session::flash('error', trans('texts.limits_not_met'));
                return redirect()->to('view/' . $this->invitation->invitation_key);
            }
        }
        if ($this->isTwoStep()) {
            return;
        }
        // prepare and process payment
        $data = $this->paymentDetails($paymentMethod);
        $response = $gateway->purchase($data)->send();
        $this->purchaseResponse = (array) $response->getData();
        // parse the transaction reference
        if ($this->transactionReferenceParam) {
            $ref = $this->purchaseResponse[$this->transactionReferenceParam];
        } else {
            $ref = $response->getTransactionReference();
        }
        // wrap up
        if ($response->isSuccessful() && $ref) {
            $payment = $this->createPayment($ref, $paymentMethod);
            // TODO move this to stripe driver
            if ($this->invitation->invoice->account->account_key == NINJA_ACCOUNT_KEY) {
                Session::flash('trackEventCategory', '/account');
                Session::flash('trackEventAction', '/buy_pro_plan');
                Session::flash('trackEventAmount', $payment->amount);
            }
            return $payment;
        } elseif ($response->isRedirect()) {
            $this->invitation->transaction_reference = $ref;
            $this->invitation->save();
            //Session::put('transaction_reference', $ref);
            Session::save();
            $response->redirect();
        } else {
            throw new Exception($response->getMessage() ?: trans('texts.payment_error'));
        }
    }