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Attach Dettach are updated Distributor: requestPayment fixed now distributor was sending the product to customer productType: reduce and getCost method now is not abstract(redundant) Method addToCounters is used to avoid of problem of same product separated in array(products). This method will unite same products Party: MoneyChannel and ProductChannel are now static(each party will have the same channel) Product: Updated: split method, now it makes deep copy of product(it was making copy of Product Type and it was one link, so by changing 1 you were also changing another) Request: getDelivery cost is UPDATED(now you set a percentage of margin from Distributor 0-100%) That's it, have fun Edo :)