In a gateway model, the merchant has to sign a contract with PXP Financial and each provider directly. Providers will settle the money to the merchant. In an aggregation model, the merchant will sign the contract only with PXP Financial (who has aggregation contracts with the relevant providers). Providers will settle the funds to PXP Financial who will aggregate the money and transfer it to the merchant in one single payout, this is usually daily or weekly. The majority of merchants would select the aggregation model because it is much easier and convenient from a contractual and settlement perspective.
Merchants with provider agreements in place and/or have their own payment department to handle provider relationships and settlement themselves, might choose the Payment Gateway model. It is important to note that some payment providers, such as PayPal and Ratepay, do not offer their method(s) in the aggregated model. To use such providers, merchants can use the PXP Financial gateway model which would mean a combination of gateway and aggregation services with PXP Financial.