Android Question BillingManager3 in a Class

Hi everyone,

I am trying to implement BillingManager3 in a Class to make it portable between my apps. The methods of the class are called from an activity. So far all the events of the BillingManager3 included in the class are firing except of the PurchaseCompleted. Has anyone faced this problem? Any suggestions?

Thanks in advance

P.S. All the methods are not called in the Activitity Main but in another activity. Could this be a problem?