Not sure if this is an EU thing or a Spanish thing but it seems that receiving parcels has become a royal pain in the ass now. My parents sent me something (I don't know what) and I get a letter telling me I have 8 days to finalize its "importation".
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You'll be pleased to know: my mother informs me that it is Vegemite.
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he/him 
Although I also ordered a lot and didn’t have to deal with it. Some companies will factor in the fees and customs declarations for you. I ended up only buying from larger online retailers.