Fecha de publicación: 05/01/2023 Fuente: Wipo Milk or dairy products A method, a system and a computer program product are provided for providing a merchandise aggregation service that aggregates product catalogues of a plurality of third-party merchant systems into a single aggregated service. Contents of product catalogues of each third-party merchant system are obtained, and product details are consolidated into product data. A user selects a plurality of products among the product data and adds these into a cart. Availability, price and delivery information for each product in the cart is updated by communicating with third-party merchant systems whose product catalogue contains the respective selected product. A combination of third-party merchants is determined that enables obtaining selected products for the lowest price and/or with the fastest delivery speed and presented to the user as one or more price offers. Purchase transactions are carried out for the selected products with the selected third-party merchants according to a purchase instruction received from the user.