Transitive verb and Ichidan verb
かえる
一つ大きいサイズの靴に換えてもらえませんか。
Can you exchange these shoes for a pair that is one size bigger, please?
The kanji is exchange, so this verb is to exchange. If you exchange one thing for another thing, you are going to exchange it, after all. This word refers to exchanging one thing for a similar thing.
I don't like this car. I would like to exchange it for another car (か).