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Hey, @WestonL! This is not bad for your account. We typically don't recommend giving out phone numbers, and usually just recommend keeping any conversations within the app. As long as you're upfront about it with potential buyers/sellers that you may be unavailable to respond during class times, you shouldn't run into a single issue
Protip - I like to schedule my meetups around my regular errands, that way, if the other person flakes, I don't feel like I wasted any time because I'm still out and about doing the things I needed to do anyway. It would probably be pretty convenient to complete transactions on campus, in between classes!
Just a heads up, we recommend keeping any conversations within the app so that you have this paper trail, and so our internal investigations team can assist if anything comes up. Outside paper trails might not be quite as helpful.
What types of items do you typically buy and sell?