It would be awesome if we could get some type of obvious flashy warning for order where the Paypal address do not match the shipping address. Even though I put disclaimer on my site for customers to ensure their Paypal address is up to date I often have missmatch (I can't really blame the customer). Eventually I ended missing one and sending an order to the wrong address thankfully a very small one.
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Ideally, BrickOwl would have to compute a metric such as the Levenshtein distance (ideally an improved version to move multiple characters) between the strings, and verify if it's over a certain threshold. I have C code for that stuff if Lawrence wants a reference implementation.