Most of the gos will have 4 payments: initial, ems, domestic and customs.
initial - amount for what you are paying. if applicable it will include proxy fee, paysable fees or transaction fees
ems - shipping from korea to gom. depending on the proxy and gom this payment may include unboxing fee, proxy fee, photo fee and consolidation fee
domestic - shipping from gom to you, which includes packaging fees
customs - tax and customs duty. this payment is not always applicable