A group-based communication platform can present, via a client device of the group-based communication platform, a user interface that includes a user interface element, interaction therewith, invoking a command associated with an external system. Based at partly on receiving an indication of an interaction with the user interface element, the group-based communication platform can cause payload data to be provided to the external system, wherein the payload data is associated with an indication of the command invoked via the interaction. Based at least partly on causing the payload data to be provided to the external system, a response to the payload data can be received and an interactive dialog can be presented via the user interface. The interactive dialog can be configured to prompt a user of the client device for data to be provided to the external system for performing a processing action associated with the command.