Since each affiliate needs a unique code of their own in order for us to tell where each referral has come from, we supply their codes directly to each affiliate in their individual accounts rather than giving them to you and requiring that you manually distribute them.
But it is still possible to find out what each affiliate's code is. If you have joined your own affiliate program you can get your personal code and work from there. It should appear something like this:
<a href="https://www.e-junkie.com/ecom/gb.php?cl=XXXXXX&c=ib&aff=YYYYYY" target="ejejcsingle">Click here to visit [business name].</a>
XXXXXX would be your own account ID as the merchant, and YYYYYY would be the affiliate's ID number. In your own personal code both of those numbers would be the same, but if you replace the YYYYYY number that is after the &aff= parameter with the ID number of a particular affiliate then you basically have their code.
If you need to get the ID numbers from your affiliates you can ask them, that number is displayed on their Affiliate Admin screen when they are logged in. You can also provide them the basic code and instruct them to manually insert their ID number where necessary.