I want to create a subscription app with different level and different task

[Taifun]

you might want to read this

Troubles with In App Billing subscription

there still might be some bugs in that component concerning subscriptions… see several threads here in the community… as workaround you might want to use my billing extension, see here https://puravidaapps.com/billing.php Taifun PS: @Diego do you like to put that onto your bug list?

Taifun