getCoupons fixes

@@ -1939,14 +1939,19 @@ public final class WarplySDK {
         // Get coupon sets using pure Swift implementation
         getCouponSets { couponSetsArray in
             // Coupon sets already handled by getCouponSets method
+        } failureCallback: { error in
+            print("=== getCouponSets error: ", error)
         }
     }
     
     /// Get universal coupons
-    public func getCouponsUniversal(language: String, _ completion: @escaping ([CouponItemModel]?) -> Void, failureCallback: @escaping (Int) -> Void) {
+    public func getCouponsUniversal(language: String? = nil, _ completion: @escaping ([CouponItemModel]?) -> Void, failureCallback: @escaping (Int) -> Void) {
+        // Handle language default inside the method
+        let finalLanguage = language ?? self.applicationLocale
+        
         Task {
             do {
-                let endpoint = Endpoint.getCoupons(language: language, couponsetType: "")
+                let endpoint = Endpoint.getCoupons(language: finalLanguage, couponsetType: "")
                 let response = try await networkService.requestRaw(endpoint)
                 
                 var couponsArray: [CouponItemModel] = []