code: func (c *Callbacks) OnCDOTAUserMsg_BuyBackStateAlert(fn func(*dota.CDOTAUserMsg_BuyBackStateAlert) error) {
  	c.onCDOTAUserMsg_BuyBackStateAlert = append(c.onCDOTAUserMsg_BuyBackStateAlert, fn)
  }
docs: // OnCDOTAUserMsg_BuyBackStateAlert registers a callback for EDotaUserMessages_DOTA_UM_BuyBackStateAlert