fix 'isRedeemed' field naming error in GiftCardResponse

Author: ashutoshgngwr

src/main/java/com/trynoice/api/subscription/payload/GiftCardResponse.java

@@ -25,7 +25,8 @@ public class GiftCardResponse {
     private int hourCredits;
 
     @Schema(required = true, description = "whether the gift card has been redeemed.")
-    private boolean isRedeemed;
+    @NonNull
+    private Boolean isRedeemed;
 
     @Schema(type = "integer", format = "int64", description = "optional epoch millis when the gift card expires.")
     private OffsetDateTime expiresAt;

src/test/java/com/trynoice/api/subscription/SubscriptionServiceTest.java

@@ -357,7 +357,7 @@ void getGiftCard_withValidCode() {
         val response = assertDoesNotThrow(() -> service.getGiftCard(2L, code));
         assertEquals(card.getCode(), response.getCode());
         assertEquals(card.getHourCredits(), response.getHourCredits());
-        assertEquals(card.isRedeemed(), response.isRedeemed());
+        assertEquals(card.isRedeemed(), response.getIsRedeemed());
         assertEquals(card.getExpiresAt(), response.getExpiresAt());
     }