This happens more often than people talk about. A merchant is the company or person whose products you are promoting, and they sometimes reduce how much they pay affiliates without sending any warning. When you notice it, the first thing to do is check your earnings report and confirm the change is real. Then reach out to them directly and ask about it. If they have no good reason and the new rate makes the partnership not worth your time, you can simply find another program that pays better. Has this happened to you before?