code: func (b *Bdiscord) isWebhookID(id string) bool {
  	if b.GetString("WebhookURL") != "" {
  		wID, _ := b.splitURL(b.GetString("WebhookURL"))
  		if wID == id {
  			return true
  		}
  	}
  
  	b.channelsMutex.RLock()
  	defer b.channelsMutex.RUnlock()
  
  	for _, channel := range b.channelInfoMap {
  		if channel.Options.WebhookURL != "" {
  			wID, _ := b.splitURL(channel.Options.WebhookURL)
  			if wID == id {
  				return true
  			}
  		}
  	}
  	return false
  }
docs: // isWebhookID returns true if the specified id is used in a defined webhook