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

    public function completeOffsitePurchase($input)
    {
        $this->input = $input;
        $ref = array_get($this->input, 'token') ?: $this->invitation->transaction_reference;
        if (method_exists($this->gateway(), 'completePurchase')) {
            $details = $this->paymentDetails();
            $response = $this->gateway()->completePurchase($details)->send();
            $ref = $response->getTransactionReference() ?: $ref;
            if ($response->isCancelled()) {
                return false;
            } elseif (!$response->isSuccessful()) {
                throw new Exception($response->getMessage());
            }
        }
        // check invoice still has balance
        if (!floatval($this->invoice()->balance)) {
            throw new Exception(trans('texts.payment_error_code', ['code' => 'NB']));
        }
        // check this isn't a duplicate transaction reference
        if (Payment::whereAccountId($this->invitation->account_id)->whereTransactionReference($ref)->first()) {
            throw new Exception(trans('texts.payment_error_code', ['code' => 'DT']));
        }
        return $this->createPayment($ref);
    }

 public function completeOffsitePurchase($input)
 {
     parent::completeOffsitePurchase(['token' => Request::query('pt')]);
 }