Building Slack Apps with Apex on Salesforce 

thanks for this demo Daniel, this is very helpful!

Thanks Daniel for all the information that you have shared. But, If a start listening to all the message events from slack then, if I have volume of 1 million messages per day in slack then is it not going to consume my my 1 million web service api calls in Salesforce. Is there a way to send message events for certain channels only to Salesforce from Slack.