Gst on import of services applicable?

Hello,

We are a 100% export oriented service business. We export Without Payment of Tax, having an LUT.

Have a few questions regarding Import of Services, any help would be appreciated.

1. If we buy hosting, software etc online from companies outside India and pay forex on that. GST Applicable? If so, will it be at 18%.
2. We have some ITC in our credit ledger, can we use that to pay for this?
3. If we hire some 3rd party and utilize their services, pay forex. GST would be applicable here at 18%, correct?
4. As we are 100% export, can we claim refund for these? I see that RFD01 is now completely online, including sending invoice to Authority, can service exporters utlize RFD-01 as well for claiming refund of excess ITC and payments for import of services.
5. What are the penalities if we miss-out paying import of service on a bill.

Thank you for your time.