The credit card systems in France don't include a line for the tip because there's no such thing there. Think about that. Service is almost always included; the tip is a dollar or two in cash. We usually leave $5 on a $100 meal if we were very pleased with the service, which we almost always are.
The only place on the French side that I remember the menu stating that service is not included is at Friars Bay Beach Restaurant, and it's been many years since we've been there.
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