GoHighLevel Conversations API

Add An Outbound Message

POST/conversations/messages/outbound

POST /conversations/messages/outbound Add an external outbound call. Post the necessary fields for the API to add a new outbound call It takes 7 body fields, requires the conversations/message.write scope and authenticates with a sub-account (location) token.

Request and authentication

Method: POST
Full URL: https://services.leadconnectorhq.com/conversations/messages/outbound
Scopes: conversations/message.write
Token type: Sub-account (location) token
Accepted auth: OAuth Access Token, Private Integration Token
API version header: Version: 2021-07-28
Schema verified: 22 June 2026

Request body

JSON body fields. Nested objects are shown indented under their parent.

Name	Type	Description
`type`required	`string`	Message Type One of: `Call` Example: `Call`
`attachments`	`array`	Array of attachments
`conversationId`required	`string`	Conversation Id Example: `ve9EPM428h8vShlRW1KT`
`conversationProviderId`required	`string`	Conversation Provider Id Example: `61d6d1f9cdac7612faf80753`
`altId`	`string`	external mail provider's message id Example: `61d6d1f9cdac7612faf80753`
`date`	`string`	Date of the outbound message
`call`	`unknown`	Phone call dialer and receiver information

Response fields

Top-level fields returned on a successful call.

Name	Type	Description
`success`required	`boolean`	—
`conversationId`required	`string`	Conversation ID. Example: `ABC12h2F6uBrIkfXYazb`
`messageId`required	`string`	This is the main Message ID Example: `t22c6DQcTDf3MjRhwf77`
`message`required	`string`	—
`contactId`	`string`	—
`dateAdded`	`string`	—
`emailMessageId`	`string`	—

Example request

Copy-paste ready. Swap YOUR_TOKEN for your access token or Private Integration Token.

curl -X POST 'https://services.leadconnectorhq.com/conversations/messages/outbound' \
  -H 'Authorization: Bearer YOUR_TOKEN' \
  -H 'Version: 2021-07-28' \
  -H 'Content-Type: application/json' \
  -d '{
    "type": "Call",
    "conversationId": "ve9EPM428h8vShlRW1KT",
    "conversationProviderId": "61d6d1f9cdac7612faf80753"
  }'

Skip the schema lookup

Hylo gives your AI agent this schema — and the other 52 documented here — without you looking anything up. Ask in plain English; it picks the endpoint, fills the body, and can run the call against your own sub-account.

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