Itemize uses a number of data points as it considers tip presence.  A merchant’s category, e.g. Dining & Entertainment, Taxi & Car Services, etc., can help indicate whether a given merchant might accept tips.  Common tip phrases, e.g. tip, gratuity, service are also considered.  

If a tip is thought to be present, the document will be forwarded on for an additional layer of processing, where a tip value will be extracted and the grand total value updated.

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