You can use all MC commands or utilize special commands for chat messages (&chat message) or timeouts (&timeout 100ms) or set a delay for all commands (&setdelay 500ms). NOTE: The "ms" is optional, the duration is always specified in milliseconds.
To retrieve the result of a command, please enter only one command.
Right-click and copy the link, then send a GET request to execute the commands or retrieve the result if only one command is specified.