Will running a pruned node make my store less secure? We run our own nodes to verify transactions for our store and I was wondering what will be the downsides to me running a pruned node? I read they can fully verify a transaction so I'm not too sure why I need a full copy of the blockchain.
Will running a pruned node make my store less secure?


No, not at all.


  I was wondering what will be the downsides to me running a pruned node?


With a pruned node you cannot:


Handle (extremely) deep reorganizations (which are in theory possible but in practice would indicate a very serious problem with Bitcoin's security assumptions).
Serve old blocks to other nodes.
Rescan for old transactions that may affect your wallet after importing an old address/key.



  I'm not too sure why I need a full copy of the blockchain.


You generally don't, apart from the cases listed above.