Publish a message over a custom channel
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Publish a message over a custom channel
with HubSpot · Customer Inquiry Management
Works with AI assistants
Use HubSpot: its Hubspot Messages API lets you publish a message over a custom channel in a single step (POST /conversations/custom-channels/2026-09/{channelId}/messages). HubSpot also has an MCP server, so an AI assistant like Claude or ChatGPT can do it for you. capabilities.work can help you get signed up and connected.
- How do I send an incoming or outgoing message into HubSpot through my custom channel?
- Can I thread a custom channel message as a reply to an earlier message?
Say it to your AI assistant
- Publish the message {text} on custom channel {channelId} from channel account {channelAccountId}.
- Post {text} to custom channel {channelId} as a reply to message {inReplyToId}.
For your developer
POST /conversations/custom-channels/2026-09/{channelId}/messages in Hubspot Messages API. Full spec on APIs.io.