...
A fee model is a model via which you can automatically charge advertisers for the traffic and/or the conversions the partners in your platform are generating. How the advertiser will be billed (via invoice or deposit), depends on the billing mode you have selected for your advertiser. Please note that creating a fee model is only necessary when you have selected ‘postpayment direct’, ‘postpayment standard’, ‘prepayment’ or ‘self billing’ as a billing option. If you have selected ‘no billing’, you will find that it is not possible to create a fee model.
...
CPM, which means you will charge your advertiser for every 1000 views the partners in your network generate.
CPC, which means you will charge your advertiser for every click your partners generate.
CPA, which means you will charge your advertiser for every conversion your partners generate. In most cases, these conversions will be attributed based on clicks (PC), but you can decide to charge your advertiser for post view conversions as well by clicking on the button ‘+ postview’.
...