Sends an ephemeral message to a channel.

Required Params

• channel - Channel, private group, or IM channel to send message to. Can be an encoded ID, or a name. See below for more details.
• text - Text of the message to send. See below for an explanation of formatting. ex: Hello world
• user - id of the user who will receive the ephemeral message. The user should be in the channel specified by the channel argument.

Optional Params

• as_user - Pass true to post the message as the authed user, instead of as a bot. Defaults to false. See authorship below. ex: true
• attachments - Structured message attachments. ex: [{"pretext": "pre-hello", "text": "text-world"}]
• blocks - A JSON-based array of structured blocks, presented as a URL-encoded string ex: [{"type": "section", "text": {"type": "plain_text", "text": "Hello world"}}]
• link_names - Find and link channel names and usernames. ex: 1
• parse - Change how messages are treated. Defaults to none. See below. ex: full

Errors the API can return:

• channel_not_found - Value passed for channel was invalid.
• is_archived - Channel has been archived.
• msg_too_long - Message text is too long
• no_text - No message text provided
• rate_limited - Application has posted too many messages, read the Rate Limit documentation for more information
• user_not_in_channel - Cannot post user messages to a channel they are not in.