Gävle (need quick answers)

Hello!  :)

I wonder if here is someone from Gävle to give me some quick information considered public transport?

1. How to get from airport to the city? Is there some train like Arlanda express maybe? Or just bus? Where can I buy ticket on airport? In Pressbyrån?
2. Does Gävle has metro or just buses? I have never been there before :(
3. How do you pay bus (metro?) in Gävle? Is there any card like SL access kort in Stockholm?

I hope I will get some answers here. I haven't found this information nowhere.

Thank you in advance.

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