Abstract: A system for in-application sale of physical goods on a mobile device is provided. The system includes one or more computer devices, and computer processors. The system includes a fulfillment module, a purchase module, and an application software for e-commerce sale of physical goods (“p-sale app”). The p-sale app is formed by integrating an e-commerce physical product sale protocol into an app lacking functionality for the sale of physical products (“no-sale app”). The p-sale app is configured to (i) send one or more product offer request(s) to the fulfillment module. The fulfillment module is configured to receive the product offer request(s) and (ii) search one or more databases containing information on a plurality of physical products. The search is based on the product, customer, and/or app criteria in the product offer request(s). The fulfillment module subsequently (iii) generates a product offer profile based on the criteria, and (iv) sends the product offer request to the p-sale app.