支付系统中的类模型

I need help about the structure about a payment system. Here is how it works: Manager give to Seller an item. This item can be sold at any price and the Manager will receive a percentage. When Seller sells that item to Customer I need to save two payments. Customer->Seller and Seller->Manager. So I have created three classes:

Payment

class Payment{

private $id;

private $item;

private $date;

private $status;

private $amount;
}

Payment_Customer

class Payment_Customer extends Payment{

private $frequency;

private $rating;

private $amount_paid;

}

Payment_Seller

class Payment_Seller extends Payment{

private $percentage;

private $amount_due;

private $max_date;

}

But now I have a problem because I need an object 'entire payment' that contains both payment types so I added an object Payment_Customer and Payment_Seller into Payment class that now looks like this:

class Payment{

private $id;

private $date;

private $status;

private $amount;

private $payment_customer;

private $payment_seller;
}

That's wrong! What could be a good solution for this? Create a new class Entire_Payment which contains both payment types? Or change classes model? Any suggestion? Thanks in advance.