Abstract: The present invention refers to a digital method of centralizing, optimizing and negotiating the purchase of goods and services implemented by computer, wherein at least one authorised user (101) by the company or purchase centre (108), identifies the products (102) to be acquired and proceeds to consult with at least one potential supplier (103) through a digital purchase platform (109), hosted in a dedicated server, locally or in a cloud. The company or purchase centre (109) proceeds to validate the proposals (104) from the suppliers (103), and can create different, economically more advantageous choice scenarios from the proposals (104) that satisfy all the restrictions imposed by the company or purchase centre (109) and by the suppliers (103).