As always, read the contract you are asked to sign. Usually these days, it's all electronic and there is an agent in front of you and a line of people behind you, glaring. But, it's your money.
You don't need to read everything, but the key financials ought to be right up front. Look for the one-way fee and if's there and isn't $0, that's a problem. It's what you sign for that counts.