The POST method is not supported for this route Laravel

Payment success redirect working but if the payment has been cancelled, it does not redirect. How can i fix this? Payment success redirect working but if the payment has been cancelled, it does not redirect. How can i fix this? Error: The POST method is not supported for this route. Supported methods: GET, HEAD. Error İmage:

Paymax:

else if($payment_method == "paymax"){
        $sid = 1;

        $settings = Settings::editGeneral($sid);

        $paymaxHelper = new Paymax(
                                    $settings->paymax_username,
                                    $settings->paymax_password,
                                    $settings->paymax_shopcode,
                                    $settings->paymax_hash
                                );

        $site_currency = ( $site_currency == "USD" ? "USD" : $site_currency);
        $order_data = array(
            'productName' => $item_names_data,
            'productData' => array(
                array(
                    'productName'=>$item_names_data,
                    'productPrice'=>$final_amount,
                    'productType'=>'DIJITAL_URUN',
                ),
            ),
            'productType' => 'DIJITAL_URUN',
            'productsTotalPrice' => $final_amount,
            'orderPrice' => $final_amount,
            'currency' => $site_currency,
            'orderId' => $purchase_token,
            'locale' => 'tr',
            'conversationId' => '',
            'buyerName' => $order_firstname,
            'buyerSurName' => $order_firstname,
            'buyerGsmNo' => '05xxXXXxxXX',
            'buyerIp' => $_SERVER['REMOTE_ADDR'],
            'buyerMail' => $order_email,
            'buyerAdress' => '',
            'buyerCountry' => '',
            'buyerCity' => '',
            'buyerDistrict' => '',
            'callbackOkUrl' => $website_url.'/paymax-success/'.$purchase_token,
            'callbackFailUrl' => $website_url.'/paymax-failure/'.$purchase_token
        );
        /*Sipariş Bilgilerinizi link oluşturmak için sınıfa gönderin*/
        $request = $paymaxHelper->create_payment_link($order_data);
                                
        if($request['status']=='success' && isset($request['payment_page_url']))
        {
            $odeme_link = $request['payment_page_url'];
            return redirect($odeme_link);
        }
        
      

   return view('deposit')->with($totaldata);


}

    public function paymax_callback(Request $request){
    $ord_token = $request->orderId;
        
    $itemOrder = DB::table('item_order')->where('purchase_token', $ord_token)->first();
    if($itemOrder){
        $response = $this->paymax_order_success($ord_token, $request);
    }else{
        $response = $this->deposit_paymax_success($ord_token, $request);
    }
    if($response["status"]){
        echo 'OK';
        exit();
    }
    echo $response["message"];
    exit();
}

Failure:

    public function paymax_failure($ord_token, Request $request){
    return view('cancel');
}

Routes:

Route::get('/paymax-success/{ord_token}', ['as' => 'paymax-success','uses'=>'ItemController@paymax_success']);

Route::get('/paymax-failure/{ord_token}', ['as' => 'paymax-failure','uses'=>'ItemController@paymax_failure']);

Route::post('/paymax-callback', ['as' => 'paymax-callback','uses'=>'ItemController@paymax_callback']);

via Chebli Mohamed