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Do Square credit card readers allow for personal use?
What I should have done in the first place was just ask them.  From their customer support team: Thanks for writing in and for your interest in Square. It is perfectly acceptable to use Square for personal business, such as a yard sale. You do not need to have a registered business to take advantage of Square and the ability to accept credit cards. Just please note that it is against our Terms of Service to process prepaid cards, gift cards or your own credit card using your own Square account. Additionally, you may not use Square as a money transfer system. For every payment processed through Square, you must provide a legitimate good or service. Please let me know if you have any additional concerns.