(Q)Buying Olx Poland's used items in overseas

I'm in South Korea and I'm thinking about purchasing product in Poland Olx, (product price 4500~6000zt)

so can I trade safely using Olx parcels? (Does the protection package work for overseas delivery?)

Does olx parcels support overseas delivery?

Who will pay for the shipping fee?

Please let me know the process of a safe Olx parcel transaction.

• And if you know the webpage where you can calculate the price of Olx parcels, please let me know

Thank you.