Send LinkedIn voice message
curl --request POST \
--url https://app.gtm-api.com/linkedin/v4/api/linkedin-messages/send-voice \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--header 'Team-SID: <api-key>' \
--data '
{
"linkedin_account_sid": "<string>",
"audio": {
"url": "<string>",
"base64": "<string>"
},
"linkedin_conversation_sid": "<string>",
"ln_id": "<string>",
"sn_id": "<string>",
"client_reference": "<string>",
"confirmed_not_sent": "<string>",
"confirmed_sent": "<string>"
}
'import requests
url = "https://app.gtm-api.com/linkedin/v4/api/linkedin-messages/send-voice"
payload = {
"linkedin_account_sid": "<string>",
"audio": {
"url": "<string>",
"base64": "<string>"
},
"linkedin_conversation_sid": "<string>",
"ln_id": "<string>",
"sn_id": "<string>",
"client_reference": "<string>",
"confirmed_not_sent": "<string>",
"confirmed_sent": "<string>"
}
headers = {
"Authorization": "Bearer <token>",
"Team-SID": "<api-key>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {
Authorization: 'Bearer <token>',
'Team-SID': '<api-key>',
'Content-Type': 'application/json'
},
body: JSON.stringify({
linkedin_account_sid: '<string>',
audio: {url: '<string>', base64: '<string>'},
linkedin_conversation_sid: '<string>',
ln_id: '<string>',
sn_id: '<string>',
client_reference: '<string>',
confirmed_not_sent: '<string>',
confirmed_sent: '<string>'
})
};
fetch('https://app.gtm-api.com/linkedin/v4/api/linkedin-messages/send-voice', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://app.gtm-api.com/linkedin/v4/api/linkedin-messages/send-voice",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'linkedin_account_sid' => '<string>',
'audio' => [
'url' => '<string>',
'base64' => '<string>'
],
'linkedin_conversation_sid' => '<string>',
'ln_id' => '<string>',
'sn_id' => '<string>',
'client_reference' => '<string>',
'confirmed_not_sent' => '<string>',
'confirmed_sent' => '<string>'
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json",
"Team-SID: <api-key>"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://app.gtm-api.com/linkedin/v4/api/linkedin-messages/send-voice"
payload := strings.NewReader("{\n \"linkedin_account_sid\": \"<string>\",\n \"audio\": {\n \"url\": \"<string>\",\n \"base64\": \"<string>\"\n },\n \"linkedin_conversation_sid\": \"<string>\",\n \"ln_id\": \"<string>\",\n \"sn_id\": \"<string>\",\n \"client_reference\": \"<string>\",\n \"confirmed_not_sent\": \"<string>\",\n \"confirmed_sent\": \"<string>\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Authorization", "Bearer <token>")
req.Header.Add("Team-SID", "<api-key>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://app.gtm-api.com/linkedin/v4/api/linkedin-messages/send-voice")
.header("Authorization", "Bearer <token>")
.header("Team-SID", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"linkedin_account_sid\": \"<string>\",\n \"audio\": {\n \"url\": \"<string>\",\n \"base64\": \"<string>\"\n },\n \"linkedin_conversation_sid\": \"<string>\",\n \"ln_id\": \"<string>\",\n \"sn_id\": \"<string>\",\n \"client_reference\": \"<string>\",\n \"confirmed_not_sent\": \"<string>\",\n \"confirmed_sent\": \"<string>\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://app.gtm-api.com/linkedin/v4/api/linkedin-messages/send-voice")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Team-SID"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"linkedin_account_sid\": \"<string>\",\n \"audio\": {\n \"url\": \"<string>\",\n \"base64\": \"<string>\"\n },\n \"linkedin_conversation_sid\": \"<string>\",\n \"ln_id\": \"<string>\",\n \"sn_id\": \"<string>\",\n \"client_reference\": \"<string>\",\n \"confirmed_not_sent\": \"<string>\",\n \"confirmed_sent\": \"<string>\"\n}"
response = http.request(request)
puts response.read_body{
"success": true,
"operation": "action",
"action": "<string>",
"item": {
"sid": "<string>",
"team_sid": "<string>",
"linkedin_account_sid": "<string>",
"linkedin_conversation_sid": "<string>",
"messenger_type": "linkedin",
"linkedin_type": "message",
"type": "inbox",
"automation": "auto",
"ln_member_id": "<string>",
"ln_id": "<string>",
"sn_id": "<string>",
"recruiter_id": "<string>",
"nickname": "<string>",
"subject": "<string>",
"text": "<string>",
"client_reference": "<string>",
"attachments": [
{
"id": "<string>",
"urn": "<string>",
"name": "<string>",
"content_type": "<string>",
"content_url": "<string>",
"file_byte_size": 123,
"file_name": "<string>",
"file_type": "<string>"
}
],
"reactions": [
{
"emoji": "<string>",
"count": 123,
"is_viewer_reacted": true,
"first_reacted_at": "<string>"
}
],
"is_deleted": true,
"reply_to": {
"linkedin_message_sid": "<string>",
"message_hash": "<string>",
"sender_ln_id": "<string>",
"sender_ln_member_id": "<string>",
"text": "<string>",
"sent_at": "<string>"
},
"message_hash": "<string>",
"sent_at": "<string>",
"custom_content": {},
"created_at": "<string>",
"updated_at": "<string>",
"deleted_at": "<string>"
},
"result": {},
"meta": {
"trace_id": "<string>",
"span_id": "<string>",
"timestamp": "<string>",
"duration_ms": 1,
"team_sid": "<string>",
"actor_type": "<string>"
},
"pacing": {
"linkedin_account_sid": "<string>",
"limit_type": "<string>",
"next_call_after": "<string>",
"remaining_today": 1
}
}{
"success": false,
"error": {
"code": "validation_failed",
"message": "<string>",
"recoverable": true,
"suggestion": "<string>",
"field_errors": {},
"blockers": [
{
"type": "<string>",
"severity": "hard",
"description": "<string>",
"entity_sid": "<string>",
"resolution": "<string>",
"resolution_hint": "<string>",
"count": 123
}
],
"context": {}
},
"meta": {
"trace_id": "<string>",
"span_id": "<string>",
"timestamp": "<string>",
"duration_ms": 1,
"team_sid": "<string>",
"actor_type": "<string>"
}
}{
"success": false,
"error": {
"code": "validation_failed",
"message": "<string>",
"recoverable": true,
"suggestion": "<string>",
"field_errors": {},
"blockers": [
{
"type": "<string>",
"severity": "hard",
"description": "<string>",
"entity_sid": "<string>",
"resolution": "<string>",
"resolution_hint": "<string>",
"count": 123
}
],
"context": {}
},
"meta": {
"trace_id": "<string>",
"span_id": "<string>",
"timestamp": "<string>",
"duration_ms": 1,
"team_sid": "<string>",
"actor_type": "<string>"
}
}linkedin_messages
Send LinkedIn voice message
Send one voice note on the basic LinkedIn messenger (outward action). audio arrives as a https:// url or base64 (any common format) and is normalized server-side to AAC/m4a, hard-capped at 60 s. Same guard chain as send_linkedin_message plus audio validation. Fire-on-success: a row is inserted only on terminal success; no text body. Sends once per client_reference and place (the thread, else the person): a repeat is answered, never sent twice; on a 409 read error.context.send_outcome, never resend under a new key. A keyed repeat is answered before its audio is read. When NOT: text DM → send_linkedin_message; SN threads → send_linkedin_sales_nav_message; audio longer than 60 s is rejected, so trim client-side first.
Contract:
- MCP tool
send_linkedin_voice_message, registry packagemcp.linkedin/linkedin_messages, mountlinkedin.messaging. - Operation
action, response envelopeaction. - Flags: dangerous: the MCP layer gates it behind a preview/commit token, and the effect cannot be undone through this API; paced: a call spends the
send_messagessmart-limit bucket of the account it runs on, and calls of one bucket are spaced per account. A short wait is slept by the server; a longer one answers 429rate_limitedwithcontext.retry_after, and the same call succeeds from that moment. Parallel calls on one account queue behind each other.
POST
/
api
/
linkedin-messages
/
send-voice
Send LinkedIn voice message
curl --request POST \
--url https://app.gtm-api.com/linkedin/v4/api/linkedin-messages/send-voice \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--header 'Team-SID: <api-key>' \
--data '
{
"linkedin_account_sid": "<string>",
"audio": {
"url": "<string>",
"base64": "<string>"
},
"linkedin_conversation_sid": "<string>",
"ln_id": "<string>",
"sn_id": "<string>",
"client_reference": "<string>",
"confirmed_not_sent": "<string>",
"confirmed_sent": "<string>"
}
'import requests
url = "https://app.gtm-api.com/linkedin/v4/api/linkedin-messages/send-voice"
payload = {
"linkedin_account_sid": "<string>",
"audio": {
"url": "<string>",
"base64": "<string>"
},
"linkedin_conversation_sid": "<string>",
"ln_id": "<string>",
"sn_id": "<string>",
"client_reference": "<string>",
"confirmed_not_sent": "<string>",
"confirmed_sent": "<string>"
}
headers = {
"Authorization": "Bearer <token>",
"Team-SID": "<api-key>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {
Authorization: 'Bearer <token>',
'Team-SID': '<api-key>',
'Content-Type': 'application/json'
},
body: JSON.stringify({
linkedin_account_sid: '<string>',
audio: {url: '<string>', base64: '<string>'},
linkedin_conversation_sid: '<string>',
ln_id: '<string>',
sn_id: '<string>',
client_reference: '<string>',
confirmed_not_sent: '<string>',
confirmed_sent: '<string>'
})
};
fetch('https://app.gtm-api.com/linkedin/v4/api/linkedin-messages/send-voice', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://app.gtm-api.com/linkedin/v4/api/linkedin-messages/send-voice",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'linkedin_account_sid' => '<string>',
'audio' => [
'url' => '<string>',
'base64' => '<string>'
],
'linkedin_conversation_sid' => '<string>',
'ln_id' => '<string>',
'sn_id' => '<string>',
'client_reference' => '<string>',
'confirmed_not_sent' => '<string>',
'confirmed_sent' => '<string>'
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json",
"Team-SID: <api-key>"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://app.gtm-api.com/linkedin/v4/api/linkedin-messages/send-voice"
payload := strings.NewReader("{\n \"linkedin_account_sid\": \"<string>\",\n \"audio\": {\n \"url\": \"<string>\",\n \"base64\": \"<string>\"\n },\n \"linkedin_conversation_sid\": \"<string>\",\n \"ln_id\": \"<string>\",\n \"sn_id\": \"<string>\",\n \"client_reference\": \"<string>\",\n \"confirmed_not_sent\": \"<string>\",\n \"confirmed_sent\": \"<string>\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Authorization", "Bearer <token>")
req.Header.Add("Team-SID", "<api-key>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://app.gtm-api.com/linkedin/v4/api/linkedin-messages/send-voice")
.header("Authorization", "Bearer <token>")
.header("Team-SID", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"linkedin_account_sid\": \"<string>\",\n \"audio\": {\n \"url\": \"<string>\",\n \"base64\": \"<string>\"\n },\n \"linkedin_conversation_sid\": \"<string>\",\n \"ln_id\": \"<string>\",\n \"sn_id\": \"<string>\",\n \"client_reference\": \"<string>\",\n \"confirmed_not_sent\": \"<string>\",\n \"confirmed_sent\": \"<string>\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://app.gtm-api.com/linkedin/v4/api/linkedin-messages/send-voice")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Team-SID"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"linkedin_account_sid\": \"<string>\",\n \"audio\": {\n \"url\": \"<string>\",\n \"base64\": \"<string>\"\n },\n \"linkedin_conversation_sid\": \"<string>\",\n \"ln_id\": \"<string>\",\n \"sn_id\": \"<string>\",\n \"client_reference\": \"<string>\",\n \"confirmed_not_sent\": \"<string>\",\n \"confirmed_sent\": \"<string>\"\n}"
response = http.request(request)
puts response.read_body{
"success": true,
"operation": "action",
"action": "<string>",
"item": {
"sid": "<string>",
"team_sid": "<string>",
"linkedin_account_sid": "<string>",
"linkedin_conversation_sid": "<string>",
"messenger_type": "linkedin",
"linkedin_type": "message",
"type": "inbox",
"automation": "auto",
"ln_member_id": "<string>",
"ln_id": "<string>",
"sn_id": "<string>",
"recruiter_id": "<string>",
"nickname": "<string>",
"subject": "<string>",
"text": "<string>",
"client_reference": "<string>",
"attachments": [
{
"id": "<string>",
"urn": "<string>",
"name": "<string>",
"content_type": "<string>",
"content_url": "<string>",
"file_byte_size": 123,
"file_name": "<string>",
"file_type": "<string>"
}
],
"reactions": [
{
"emoji": "<string>",
"count": 123,
"is_viewer_reacted": true,
"first_reacted_at": "<string>"
}
],
"is_deleted": true,
"reply_to": {
"linkedin_message_sid": "<string>",
"message_hash": "<string>",
"sender_ln_id": "<string>",
"sender_ln_member_id": "<string>",
"text": "<string>",
"sent_at": "<string>"
},
"message_hash": "<string>",
"sent_at": "<string>",
"custom_content": {},
"created_at": "<string>",
"updated_at": "<string>",
"deleted_at": "<string>"
},
"result": {},
"meta": {
"trace_id": "<string>",
"span_id": "<string>",
"timestamp": "<string>",
"duration_ms": 1,
"team_sid": "<string>",
"actor_type": "<string>"
},
"pacing": {
"linkedin_account_sid": "<string>",
"limit_type": "<string>",
"next_call_after": "<string>",
"remaining_today": 1
}
}{
"success": false,
"error": {
"code": "validation_failed",
"message": "<string>",
"recoverable": true,
"suggestion": "<string>",
"field_errors": {},
"blockers": [
{
"type": "<string>",
"severity": "hard",
"description": "<string>",
"entity_sid": "<string>",
"resolution": "<string>",
"resolution_hint": "<string>",
"count": 123
}
],
"context": {}
},
"meta": {
"trace_id": "<string>",
"span_id": "<string>",
"timestamp": "<string>",
"duration_ms": 1,
"team_sid": "<string>",
"actor_type": "<string>"
}
}{
"success": false,
"error": {
"code": "validation_failed",
"message": "<string>",
"recoverable": true,
"suggestion": "<string>",
"field_errors": {},
"blockers": [
{
"type": "<string>",
"severity": "hard",
"description": "<string>",
"entity_sid": "<string>",
"resolution": "<string>",
"resolution_hint": "<string>",
"count": 123
}
],
"context": {}
},
"meta": {
"trace_id": "<string>",
"span_id": "<string>",
"timestamp": "<string>",
"duration_ms": 1,
"team_sid": "<string>",
"actor_type": "<string>"
}
}Authorizations
Access token issued by gtm.service.id. Its access_identity claim carries team_sid, actor_sid and actor_type, and that team scope is authoritative.
Team scope for tokens that do not carry one. Ignored when the token already names a team.
Body
application/json
Request body of send_linkedin_voice_message.
LinkedIn account sid (ln_ac_…).
Required string length:
18Pattern:
^ln_ac_Exactly one of url / base64; normalized server-side to AAC/m4a ≤ 60 s.
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Existing basic-messenger thread; provide this OR a profile URN.
Required string length:
18Pattern:
^ln_cv_Regular-profile URN for a new thread.
Maximum string length:
128Sales Navigator URN; interchangeable with ln_id.
Maximum string length:
64Your key for this ONE message (max 255, byte for byte): one key per message, the same key on every repeat of it. The key and its place (the thread, else the person) are one message whatever it says, and a repeat never goes out twice: it answers 200 with the row the first send stored (result.idempotent_replay, result.content_differs when this request says something else) or 409 naming error.context.send_outcome (in_flight, unknown with retry_after and send_decisive_at, or sent; not_sent with blocking_activity_log_sid when another message holds the place). The same key at another place is another message. Without a key the same words to the same place count as a repeat for an hour after they went out. Stored on the row and searchable; check_linkedin_message_sent asks by it.
Maximum string length:
255A person's word that an earlier attempt of THIS message is not on LinkedIn: its activity_log_sid (ln_al_...), from the 409 or check_linkedin_message_sent, given only after someone looked at the conversation. Taken once the attempt can no longer land (before that: 409 send_outcome_unknown, waiting_for may_still_land, retry_after and send_decisive_at that moment): it settles that attempt not_sent and this request goes out. Moot when the attempt is no longer in doubt; another message's sid is 422 not_this_message.
Required string length:
18Pattern:
^ln_al_A person's word that an earlier attempt of THIS message IS on LinkedIn: its activity_log_sid, as for confirmed_not_sent (never both). Taken at once; it settles the attempt sent and sends nothing: the answer is 409 concurrent_send_in_flight with send_outcome sent, or 200 with the row once it is stored. Another message's sid is 422 not_this_message; an attempt already proved not sent is 409 confirmed_sent_contradicts.
Required string length:
18Pattern:
^ln_al_Response
action success envelope.
Available options:
true Available options:
action kebab-case verb; matches the route segment.
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