This article demonstrates automatically refreshing dashboards using apex scheduled job that you can plan to run at specific times.
It uses a custom setting to store the dashboard Ids then a scheduled job to get all dashboard Ids from the custom setting and refresh the dashboard at specific time or multiple times a day.
Tag: API
This article walk you through using the Slack API within Salesforce Apex. This contains an example of unarchiving the Slack channel using API: https://api.slack.com/methods/conversations.unarchive
This article has two apex invocable actions that can be invoked from the flow and other apex classes.
The following article demonstrates exposing the apex class as a REST web service for creating a lead record in Salesforce. It is designed to handle HTTP POST requests containing lead data in JSON format.