Tizen Developers

Please add privilege if you already not ... 

<tizen:privilege name="http://tizen.org/privilege/billing"/>

Some usefull resources

http://img-developer.samsung.com/onlinedocs/gear/Extension_PG_Web/html/prog_guide/inapp_ww.htm

http://developer.samsung.com/iap/developer-api

That's the link I got that code from!

I did everything as API says!

- I added all the privileges.

- I added items thought the Samsung Seller Office for that application.

- I used the Sample.

- I made my own app using API

Maybe I have incorrect understanding of 

webapis.inapppurchase.getItemList(1, 15, "ALL", "IAP_SUCCESS_TEST_MODE", successCallback, errorCallback);

Must I see any other result beside:

Create InAppPurchaseManager constructor
VM47:1 getItemList() entered
VM47:1 startNumber : 1
VM47:1 mode : IAP_SUCCESS_TEST_MODE
VM47:1 type : ALL

function successCallback(result) {
       if (result._items.length === 0){
	      console.log("No item");
	   }
	   else {
	      for (var i = 0; i < result._items.length; i++) {
	         console.log("Item ID: " + result._items[i].mItemId);
	         console.log("Item Name: " + result._items[i].mItemName);
	         console.log("Item Price: " + result._items[i].mItemPrice);
	      }
	   }
	}
	
	function errorCallback(error) {
	   console.log(error.name + " : " + error.message);
	}
	
	webapis.inapppurchase.getItemList(1, 15, "ALL", "IAP_SUCCESS_TEST_MODE", successCallback, errorCallback);