Software as a Service (SaaS) provider offering an online platform of e-business software applications and services to Group Purchasing Organizations (GPOs) to include buying groups, cooperatives, associations, franchises, and industry-specific trading networks; The offering allows GPO members (buyers) to purchase essential goods and services from GPO vendors (sellers) by means of an online marketplace; The offering allows GPO participants to electronically exchange procure-to-pay (P2P) transaction sets by means of an online b2b exchange; The offering allows GPO corporate staff to administer and manage vendor rebate and loyalty reward programs by means of an online portal; The offering allows GPO participants to review their individual performance KPIs, perform data analyses, generate reports, and obtain AI-generated insights and recommendations by means of an online dashboard.