AC-15004::When we Enable Free Shipping Threshold for particular USPS shipping method in front store shipping price is not showing zero.

Author: shashi011

app/code/Magento/Usps/Model/ShipmentService.php

@@ -318,7 +318,7 @@ public function _parseJsonResponse($response): Result
 
                 $shippingCost = (float)$method['price'];
                 $rate->setCost($shippingCost);
-                $rate->setPrice($this->carrierModel->getMethodPrice($shippingCost));
+                $rate->setPrice($this->carrierModel->getMethodPrice($shippingCost, $method['code']));
 
                 /** @var Result $result */
                 $result->append($rate);

app/code/Magento/Usps/Model/Source/Freemethod.php

@@ -10,6 +10,29 @@
  */
 class Freemethod extends Method
 {
+    /**
+     * @param \Magento\Usps\Model\Carrier $shippingUsps
+     */
+    public function __construct(\Magento\Usps\Model\Carrier $shippingUsps)
+    {
+        parent::__construct($shippingUsps);
+        $this->code = $this->getUspsTypeMethodCode();
+    }
+
+    /**
+     * Get dynamic code based on USPS type configuration
+     *
+     * @return string
+     */
+    private function getUspsTypeMethodCode(): string
+    {
+        $uspsType = $this->shippingUsps->getConfigData('usps_type');
+
+        return match ($uspsType) {
+            'USPS_REST' => 'rest_method',
+            default => 'method',
+        };
+    }
     /**
      * @inheritDoc
      */