You'll have to create 1 account per code, each account has to have real personal info and a valid credit card added. VCCs won't work.
If Amazon finds out they might charge you for the usage for breaking the terms and conditions.
Just a heads up.
With the risk involved and the fact you really need to create an account and get the code you should sell these 4 codes for cheaper.
In my opinion these aren't worth more than 5-10$ per code.