Connect Postonce and Slack
Integrate Postonce with Slack to automate workflows, sync data between apps, and eliminate repetitive tasks with AI-powered automation.
Create Upload URL in Postonce when New Message in Channels in Slack channels
Get Media from Postonce when New Message in Channels in Slack channels
Create Post on Postonce when New Message in Channels in Slack channels
List Posts from Postonce when New Message in Channels in Slack channels
Cancel Post in Postonce when New Message in Channels in Slack channels
Popular Postonce + Slack flows
Start from a real workflow other teams are already running.
Choose a trigger
Postonce
When this happens...
New Post Created
Choose an action
Slack
Automatically do this!
Send Message
Send Interactive Message
Send Block/buttons/Intractive message using AI
View_open BlockKit Modal using JSON
Chat_update slack block or message using messageTs
Send Message as Thread
Create Channel
Set Channel Topic
Message Private Channel
Create Private Channel
Get Thread Replies
Edit Channel Message
List all Private Channels
Find Public channel
Get Messages from Slack
Add Users to Channel
Send Direct Message
Get all Channel Members
Get User Information by Email
Get User Complete Profile Details by ID
Create Canvas
List all Public Channels
Send Message with Block kit
Update Canvas
Lookup Canvas Sections
Create Upload URL in Postonce when New Message in Channels in Slack channels
Use this flowGet Media from Postonce when New Message in Channels in Slack channels
Use this flowCreate Post on Postonce when New Message in Channels in Slack channels
Use this flowList Posts from Postonce when New Message in Channels in Slack channels
Use this flowCancel Post in Postonce when New Message in Channels in Slack channels
Use this flowPublish Post on Postonce when New Message in Channels in Slack channels
Use this flowList Drafts from Postonce when New Message in Channels in Slack channels
Use this flowCreate Workflow in Postonce when New Message in Channels in Slack channels
Use this flowList Workflows from Postonce when New Message in Channels in Slack channels
Use this flowList Accounts from Postonce when New Message in Channels in Slack channels
Use this flowSupported Triggers & Actions
Everything you can automate between Postonce and Slack.
When this happensTriggers
A trigger is an event that starts a workflow.
New Post Created
Runs when a new post is created. You can filter by account and set the lookback minutes.
New Message in Channels
Runs when a new message is received in a specific Slack channel. You can select which channel to monitor.
New User Joined or Updated in Your Org
Triggers when a new user join workspace.
New Message on Slack
Runs when a new message is posted anywhere in Slack — across all channels and direct messages. No channel filter applied.
New Thread Message
Runs when new thread message.
New member join/leave or updated in channel
Triggers when a user joins, leaves, or updates their profile in the selected Slack channel.
Do thisActions
Action is the task that follows automatically within your Postonce integrations.
Create Upload URL
Generate a signed upload URL for a media file by filename; MIME type is auto-detected from the filename extension.
Get Media
Retrieve a media item's storage path and public URL using its media ID.
Create Post
Create a post to selected accounts with content, media, scheduling, and platform-specific options.
List Posts
Retrieve posts or a single post by ID. Leave limit blank to return all posts or set 1-100; supports after cursor.
Cancel Post
Cancel a scheduled or pending post by Post ID without deleting its record or published content.
Publish Post
Publish a scheduled or draft Postonce post immediately by specifying the post ID.
Learn how to build your first workflow
Follow a simple walkthrough to create, test, and launch your first automation.
- 1
Connect your apps
Link the apps you want to automate.
- 2
Configure your workflow
Set up triggers, actions, and map your data.
- 3
Test & publish
Test your workflow and publish it.
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Learn how to automate Postonce and Slack workflows.
Learn how to automate Postonce and Slack workflows.
Learn how to automate Postonce and Slack workflows.
Learn how to automate Postonce and Slack workflows.
Learn how to automate Postonce and Slack workflows.
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About Postonce
PostOnce is a social media automation platform that enables creators, teams, and businesses to schedule and crosspost content across platforms including TikTok, Instagram, YouTube, Facebook, LinkedIn, X, Threads, Bluesky, and Pinterest.
Learn moreSimilar apps
About Slack
Slack is an AI-powered work platform for team communication, collaboration, project coordination, and workflow automation. It helps organizations centralize conversations, share files, manage channels, and integrate tools to keep work moving in one place.
Learn moreFrequently Asked Questions
Sign up for a free viaSocket account, then authorize both your Postonce and Slack accounts. From there, pick a trigger in one app and an action in the other. Your first workflow can be live in under five minutes.
Yes. viaSocket uses instant triggers where available, so data moves between Postonce and Slack as soon as the event happens. Scheduled polling triggers run at a maximum interval of 15 minutes.
Yes. You can map specific fields, apply filters to skip records that do not match your conditions, and transform values before they reach Slack. No coding required.
Yes. You can set up a workflow where Postonce triggers actions in Slack, and a separate workflow where Slack triggers actions in Postonce. Both run independently and in real time.
viaSocket logs every run so you can see exactly what succeeded and what failed. Failed tasks can be retried from the dashboard without re-configuring the workflow.
Yes, there is a free plan that covers basic workflows between Postonce and Slack. Paid plans unlock higher task limits, faster polling, and advanced features like multi-step workflows and conditional logic.
No. The entire Postonce and Slack integration is built through a visual, point-and-click interface. Code blocks are available if you want them, but they are never required.
