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Three things though:
1) Do NOT over pay!
2) Do NOT under pay! (unless you're low on points, totally understandable, but make sure you pay the rest of it off later on)
3) Do not get pissy with me if I tell you that you've under paid me or over paid. I know that if it was an over payment, you're probably wanting to be generous and help me out. I've had that happen before, and I always take it in a very off kind of way. It normally feels like a handout. Please don't over pay.