As an affiliate you get commission from sales through your affiliate link/banners and affiliate shopping cart. We track affiliate link/banner and shopping cart sales differently.
Affiliate link sales are tracked via the affiliate username which is a part of the affiliate link and saved as a cookie tracking the link sale.
Affiliate shopping cart sales are tracked via the affiliate preset code created in your affiliate account and tracking the affiliate shopping cart sale for your account accordingly.
If you have more questions feel free to contact our affiliate support by submitting a ticket request.