Abstract: A method manages an online on-demand errand service. The method allows a user to request various types of errand and grants a service provider temporary access to a payment account for purchasing items for the user. The method enables the user to place online orders and have the items delivered to any desired location. For every errand, the method offers a real-time tracking of all items through the service provider's personal computing (PC) device, a bar-code system, or a QR (quick response) system. Upon delivery, the method provides a secure confirmation process using delivery photos and one-time-password (OTP) code to close the errand request. The method further offers a service assistant that is integrated into every stage of the process and implemented with artificial intelligence technologies, thus offering versatile and powerful functions to efficiently and effectively manage the errand services while securing every errand and transaction with maximum security.