Kobe Bay Shuttle KIX to Kobe

Good afternoon,

1. I read they accept all card payments, even IC cards like ICOCA. How about cash?
2. 2 of us arriving on Nov 23rd into KIX (ETA 8:50). Would it be risky to just buy the tix from the counter? We are heading to Arima Onsen via Sannomiya. Nervous to purchase online incase our timing runs.
3. Is there a Combo ticket for ferry & Port Liner from KIX to Sannomiya Station? Currently tourist pricing for the ferry is \500 and the Port Liner is \340.
4. What method of payment is accepted at the Port Liner Station? Cash? ICOCA?

Thanks!
Mel