A promotion processing system may include a point-of-sale (POS) terminal associated with a retailer and a promotions. The promotions server may be configured to store a multi-part promotion corresponding to item parts, cooperate with the POS terminal to determine whether less than all of the item parts for the multi-part promotion has been purchased, and generate a digital offer associated with unpurchased item parts. The promotions server may also be configured to accept user selection of one of applying the digital offer toward another item and a charitable donation.