Question regarding Subscription via Crysta

So I was wondering, if we plan on paying our subscriptions via Crysta, does the Crysta need to be in our passbook at the time of getting the subscription if we have free time from getting the game or whatever, or does the Crysta start getting withdrawn after the free time runs out (If the sub is setup with Crysta Withdrawal)..? I ask because the page lists that the subscription is Automatic Withdrawal and also refers to needing 0 Crysta at the moment. Would I be able to setup the Crysta auto-sub without messing up my account..?

yes you can set it up to auto from your crysta

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