Help Unitpay.ru Payment System Intergration

[eskruolis]

Hello , i seek for advice and help intergrating unitpay.ru payments to my server,  the problem is only that item does not goes to inventory after buying , i get the money , but it does not put item in to database . ANd there is no debug or something which would tell what is wrong. Installation is smooth and shows that database is connected and everything works fine , any suggestions?