I guess, you are asking about this method:
@Override
public Intent getServiceIntent(String packageName, int serviceType) {
if (serviceType == 0) {
new Intent("com.android.vending.billing.InAppBillingService.BIND");
}
return null;
}
If so, this method returns null for unsupported service types (for example of services to be supported see org.onepf.oms.AppstoreService.java). At this moment, only serviceType IN_APP_BILLING is supported, so null is retrurned for all others.
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Yury