Graphical user interfaces for facilitating end-to-end transactions on computing devices

A computing device, comprising:

• a communication device configured to communicate with a group payment system;
• an input device;
• a display device;
• a memory storing instructions;
• and
• a processor configured to execute the instructions to perform operations comprising:
• receiving, via the input device, a specification of financial contributions for a group payment event;
• in response to receiving the specification of the financial contributions, electronically transmitting the specification of the financial contributions to the group payment system and modifying an interface to display the specification of the financial contributions;
• detecting, at the computing device, a direct payment from a first user associated with the computing device to a second user associated with a second computing device, the first user being a sender of the direct payment and the second user being a recipient of the direct payment;
• in response to detecting the direct payment, transmitting, to the group payment system, a notification of the direct payment between the first user associated with the computing device to the second user associated with the second computing device;
• receiving, from the group payment system, an updated specification of revised financial contributions, generated based on the notification of the direct payment, wherein the updated specification indicates that a second contribution percentage associated with the second user has decreased and that a first contribution percentage associated with the first user has increased based on the direct payment;
• and
• in response to receiving the updated specification of the revised financial contributions, modifying the interface, based on the revised financial contributions, to indicate that the second contribution percentage associated with the second user has decreased and the first contribution percentage associated with the first user has increased.