Computer-implemented methods for technological applications involving provision of an online portal for managing a user account including an interactive GUI having functionality for pre-authorizing future transactions

A computer-implemented method, executed by one or more processors, the method comprising:

• providing, by at least one online computer platform, an online portal that is configured to enable a user to manage at least one account or at least one monetary asset of the user online;
• causing, by the at least one online computing platform, to execute a browser extension application on a computing device associated with the user, wherein the browser extension application is associated with the online portal and configured to access the at least one account or the at least one monetary asset of the user and obtain an available balance of the at least one account or the at least one monetary asset;
• generating, by the at least one online computer platform, a user interface that is displayed via the browser extension application on the computing device;
• instructing, by the at least one online computer platform, the computing device to display the user interface via the browser extension application;
• providing, by the at least one computer platform, via the online portal, the user interface including one or more interactive GUI elements on the computing device to enable the user to define at least one pre-authorized purchase that pre-authorizes an online acquisition of at least one item that is not available for sale until a future date, wherein the one or more interactive GUI elements are configured to:
• enable the user to specify an amount of money to hold, from the available balance, for the at least one pre-authorized purchase;
• cause to transmit an instruction that causes the at least one computing platform to reserve the amount of money for the at least one pre-authorized purchase such that the user cannot access or spend the amount;
• enable the user to specify one or more of:
• (1) identifying information that enables the computer system to determine a website domain at which the item will be available for purchase;
• (2) a future date at which the at least one item will be released for sale, and/or (3) the future date and a future time at which the at least one item will be released for sale;
• searching, by the at least one online computer platform, transaction information of users associated with the at least one computing platform to locate a transaction record having transaction data that is similar to the item that the user desires to purchase at the future date;
• determining, by the at least one online computer platform, based on the transaction record located, at least one electronic source at which the at least one item can be purchased when the at least one item becomes available for purchase at the future date;
• and
• executing, by the at least one online computer platform, at least one online purchase transaction, when the at least one item is released for sale, and automatically purchasing the item when the item is being released for sale.