added use delete discount code

frontend/composables/api/orders/useDeleteDiscountCode.ts

@@ -0,0 +1,25 @@
+// imports
+
+import { useMutation } from "@tanstack/vue-query";
+import { API_ENDPOINTS } from "~/constants";
+
+const useDeleteDiscountCode = () => {
+    // state
+
+    const { $axios: axios } = useNuxtApp();
+
+    // methods
+
+    const handleDeleteDiscountCode = async () => {
+        const { data } = await axios.delete(
+            API_ENDPOINTS.orders.cart.delete_discount
+        );
+        return data;
+    };
+
+    return useMutation({
+        mutationFn: () => handleDeleteDiscountCode(),
+    });
+};
+
+export default useDeleteDiscountCode;