how updatemenus buttons bind my own event function

updatemenus: [{
                      x: 0.5,
                      y: 0,
                      yanchor: "top",
                      xanchor: "center",
                      showactive: false,
                      direction: "left",
                      type: "buttons",
                      pad: {"t": 150, "r": 10},
                      buttons: [{
                        method: "animate",
                        args: [null, {
                          fromcurrent: true,
                          transition: {
                            duration: 0,
                          },
                          frame: {
                            duration: 100,
                            redraw: false
                          }
                        }],
                        label: "Play"
                      }, {
                        method: "animate",
                        args: [
                          [null],
                          {
                            mode: "immediate",
                            transition: {
                              duration: 0
                            },
                            frame: {
                              duration: 0,
                              redraw: false
                            }
                          }
                        ],
                        label: "Pause"
                      }]
                    }]

like this when i start i want to play music and pause to pause play,it seems not support this, is there some way to reach that?

Start with the supplied updatemenus configuration and trace how button methods and animation controls are handled in the repository. Search for existing tests or examples covering custom callbacks; done should be a clearly scoped implementation or documentation path for invoking user-defined play and pause handlers.