SyntaxFix
Write A Post
Hire A Developer
Questions
The URI to open a specific channel in Slack app is:
slack://channel?id=<CHANNEL-ID>&team=<TEAM-ID>
You will probably need these resources of the Slack API to get IDs of your team and channel:
GET https://slack.com/api/team.info
GET https://slack.com/api/channels.list?exclude_archived=1
Here's the full documentation from Slack