<prompt> Human: A year ago I took advantage of a balance transfer to get the intro 0 to try to get out of credit card debt a little faster. Still, I was intrigued with the first 1000 you spend you get 25000 miles offer. I signed up for square credit card processing app and ran the card about 10 times over a few days only to pay back it immediately back once the money came into my checking. Cost me 0 interest and only 2.9 percent processing fee to square. I ended up getting the free flights.So my question is after I get out of debt of course is there really any big disadvantages to signing up for a credit card from a different company when I need to travel. Get the points, use the airfare and than cancelling the card? Obviously I will need to be careful with paying it back immediately. I take a vacation about once a year so would this create any red flags if I dont have any plans on buying another house or car any time soon?tl;dr Signing up for a credit card once a year to take advantage of travel rewards, than cancelling it. Am I going to do serious harm to my credit if I do it correctly?  <response>: Square is not recommended for MS. They will close your account and if you do a lot of volume, you will also get a 1099-K.However your basic idea is right. 