Fix capture quote_id in Redsys callback and fix float amount comparison

Controller/Callback/Processpayment.php

@@ -222,7 +222,7 @@ protected function getQuote(array $merchantParameters)
         }
 
         $merchantData = json_decode(
-            htmlspecialchars_decode($merchantParameters['Ds_MerchantData']),
+            urldecode($merchantParameters['Ds_MerchantData']),
             true
         );
 

Model/MerchantParameters.php

@@ -109,7 +109,7 @@ public function execute(Quote $quote): string
             'Ds_Merchant_ConsumerLanguage' => $this->language->getLanguageByCode($codeLanguage),
             'Ds_Merchant_ProductDescription' => $this->productDescription->execute($quote),
             'Ds_Merchant_PayMethods' => 'C',
-            'Ds_Merchant_MerchantData' => json_encode(['quote_id' => $quote->getId()]),
+            'Ds_Merchant_MerchantData' => json_encode(['quote_id' => $quote->getId()])
         ];
 
         if (!empty($merchantName) && strlen($merchantName) <= ConfigInterface::MERCHANT_NAME_MAX_LENGTH) {

Model/MerchantParameters/TotalAmount.php

@@ -12,10 +12,10 @@ class TotalAmount
      * Convert amount to Redsys format
      *
      * @param CartInterface $quote
-     * @return float
+     * @return string
      */
-    public function execute(CartInterface $quote): float
+    public function execute(CartInterface $quote): string
     {
-        return floatval($quote->getGrandTotal()) * 100;
+        return number_format($quote->getGrandTotal(), 2, '', '');
     }
 }