I am new to Amazon and I would like to find out the following: Signing up under one domain allows you to use the code under other domains?
I don't see why not, unless it's in their conditions of use. [I just fast-read them and it doesn't seem to be in there - but don't hold me liable if it is]
If my memory serves me correctly you used to be able to add additional domains/websites to your profile. I just checked my account and I have multiple domains entered in my website preferences separated by spaces. I am almost positive you can use your account on all of your domains as long as you follow the guidelines.
AdesenseChic When I signed up years ago for Amazon I had one only ID and used it on one only site. This year however I wanted to create different types of stores and to be able to track their sales separately. I wrote to them asking how to do it, and they answered that I could request from them different ID's that would be under the main one. So I did, and have now many to use with different sites/shops. The nice thing about it is the fact that one can chose to see different traffic and earning statistics from different ID's, but also all together - the choice is yours.