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The terms of your merchant services agreement would determine whether you receive a discount for this and how much. In general, less risky transactions (card present vs. online sales, for example) enjoy lower fees. Chip and pin would likely be considered less risky by most merchant services providers, but you will need to check with yours to confirm.
I am going to opt out here to give someone else a chance to help you. Perhaps another expert is also a seller of merchant services and can tell you about specific terms available to you.