I recently hired a repairman to install a double oven for my mom. He used an app on his phone called "Square" to type in her credit card..?

Update: Info. Is this app trustworthy and do I need to worry about him stealing money from us??
Update 2: My mom read her credit card info aloud to him and he typed it into his app. He's the one who suggested we use the app instead of writing a check..
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