Send Regular Message (Follow-up)

Use the Send Message endpoint to send Message with Classic and Sales Navigator Inboxes

NOTE :
A single LinkedIn profile may have two separate conversation threads with your account

When building your logic:

Always check both Classic and SN inboxes during sync.
Treat threads independently when sending messages or syncing replies.
Use the appropriate endpoints based on the conversation source.

Classic LinkedIn

Check if account has a conversationId using POST /api/v1/conversations/sync

if you don’t have a existing chat with member please use

Create a new LinkedIn conversation.

Precondition
- Your LinkedIn account must already be connected.
- You should be connected with recipient, and do not have another conversations (allowed to have another conversations created by open inmail)
- Include the X-AccountId header in the request.
- You must provide the profileId of the profile you want to message.
- To send a regular message:
- Insert your custom text into the "message" field.
- Set "inMail" to false.

Field	Type	Required	Description
`profileId`	string	✅	The LinkedIn profile ID of the recipient.
`message`	string	✅	The message body you want to send.
`subject`	string		Ignored
`inMail`	boolean	✅	Must be set to `false` to indicate it is not an Open InMail message.

POST/api/v1/conversations

curl https://api.salesflow.io/public/v1/conversations \
  --request POST \
  --header 'X-AccountId: 1234567890' \
  --header 'Content-Type: application/json' \
  --header 'Authorization: Bearer YOUR_SECRET_TOKEN' \
  --data '{
  "profileId": "target_profile_id",
  "message": "your_message",
  "inMail": false
}'

RESPONSE EXAMPLE :

{
  "conversationId": "2-aabbccdd",
  "messageId": "aabbccdd",
  "createdAt": "2025-08-08T08:30:00Z"
}

if you have already existing "conversationId", use

Send a message to an existing LinkedIn conversation.

Precondition

Conversation should have not disabled “REPLY” feature
If conversation was created by sending open inmail from your side, ensure that conversation state is “ACCEPTED”.

This endpoint allows sending a new message to an existing conversation thread identified by its ID.

POST /api/v1/conversations/{id}/messages

Field	Type	Required	Description
`Id`	string	✅	LinkedIn conversation thread identifier.
`message`	string	✅	The message body you want to send.

curl 'https://api.salesflow.io/public/v1/conversations/{id}/messages' \
  --request POST \
  --header 'X-AccountId: 1234567890' \
  --header 'Content-Type: application/json' \
  --header 'Authorization: Bearer YOUR_SECRET_TOKEN' \
  --data '{
  "message": "your_message"
}'

Response :

{
  "createdAt": "2025-08-08T08:30:30Z",
  "messageId": "aabbcc"
}

Sales Navigator

Link API Reference

Precondition

Your LinkedIn account must already be connected.
You should be connected with recipient, and do not have another conversations (allowed to have another conversations created by open inmail)
Include the X-AccountId header in the request.
You must provide the profileId of the profile you want to message.
To send a regular message:

Insert your custom text into the "message" field.
Set "inMail" to false.

POST/api/v1/sales-nav/conversations

curl https://api.salesflow.io/public/api/v1/sales-nav/conversations \
  --request POST \
  --header 'X-AccountId: 1234567890' \
  --header 'Content-Type: application/json' \
  --header 'Authorization: Bearer YOUR_SECRET_TOKEN' \
  --data '{
  "profileId": "",
  "message": "",
  "subject": null,
  "authToken": null,
  "authType": null
}'

Field	Required	Type	Description
`profileId`	✅	string \| null	LinkedIn profile ID of the recipient
`message`	✅	string \| null	The actual message text to send
`subject`		string \| null	Ignore for regular message
`authToken`		string \| null	(Optional) Token used internally for advanced auth flows (leave null)
`authType`		string \| null	(Optional) Auth type metadata (leave null unless instructed)

Response:

{
  "messageId": null,
  "threadId": null
}