On April 13 Microsoft changes their price tiers for in-app-products due to strengthening US Dollar. This means that the cost of your in-app-products for both Windows and Windows Phone will rise. The changes will happen automatically, so you do not have to take any actions with regards to the Windows Store and the Windows Phone Store.
If the changes are inconvenient for you, it is possible to change price tiers by logging in to your Windows Store account.
If you are in doubt, you are welcome to contact Visiolink.
Read more here: http://microsoft-news.com/microsoft-notifies-windows-store-developers-about-change-in-price-tier-values-due-to-strengthening-us-dollar/