Prepaid Cards Setup

[Alex M]

Hey all, I think it was asked once but I can't find anything in archives. 

How can I setup prepaid cards scenario? Basically I want my users to allow
to get access lets say for 30 min in total and then I also want to have
expiration date on the account. Can some help me on setting this thing up?
Is there any module that I have to install? Tnx for help!

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