curl --request POST \
--url https://app.gtm-api.com/linkedin/v4/api/linkedin-messages/download-attachment \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--header 'Team-SID: <api-key>' \
--data '
{
"linkedin_account_sid": "<string>",
"profile_id": "<string>",
"message_id": "<string>",
"attachment_urn": "<string>"
}
'import requests
url = "https://app.gtm-api.com/linkedin/v4/api/linkedin-messages/download-attachment"
payload = {
"linkedin_account_sid": "<string>",
"profile_id": "<string>",
"message_id": "<string>",
"attachment_urn": "<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>',
profile_id: '<string>',
message_id: '<string>',
attachment_urn: '<string>'
})
};
fetch('https://app.gtm-api.com/linkedin/v4/api/linkedin-messages/download-attachment', 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/download-attachment",
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>',
'profile_id' => '<string>',
'message_id' => '<string>',
'attachment_urn' => '<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/download-attachment"
payload := strings.NewReader("{\n \"linkedin_account_sid\": \"<string>\",\n \"profile_id\": \"<string>\",\n \"message_id\": \"<string>\",\n \"attachment_urn\": \"<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/download-attachment")
.header("Authorization", "Bearer <token>")
.header("Team-SID", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"linkedin_account_sid\": \"<string>\",\n \"profile_id\": \"<string>\",\n \"message_id\": \"<string>\",\n \"attachment_urn\": \"<string>\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://app.gtm-api.com/linkedin/v4/api/linkedin-messages/download-attachment")
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 \"profile_id\": \"<string>\",\n \"message_id\": \"<string>\",\n \"attachment_urn\": \"<string>\"\n}"
response = http.request(request)
puts response.read_body{
"success": true,
"operation": "action",
"action": "<string>",
"item": "<unknown>",
"result": {
"data_url": "<string>",
"content_type": "<string>",
"file_byte_size": 123
},
"meta": {
"trace_id": "<string>",
"span_id": "<string>",
"timestamp": "<string>",
"duration_ms": 1,
"debug_url": "<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,
"debug_url": "<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,
"debug_url": "<string>"
}
}Download message attachment
Download one inbound attachment of a basic-messenger message, returned inline as a base64 data_url (nothing is persisted, no row changes). This verb is addressed by RAW LinkedIn ids, not by our message sid, so assemble it from a message row you already hold (search_linkedin_messages): linkedin_account_sid = that row’s linkedin_account_sid; message_id = that row’s message_hash (must be the 2-… form); attachment_urn = attachments[i].urn on the same row. profile_id is the ACTING account’s own LinkedIn URN: read ln_id off that linkedin_account_sid via search_linkedin_accounts, NOT the other party’s URN. 120 s budget, up to ~50 MB; spends the messaging_general bucket.
Contract:
- MCP tool
download_linkedin_message_attachment, registry packagemcp.linkedin/linkedin_messages, mountlinkedin.messaging. - Operation
action, response envelopeaction. - Flags: read only.
curl --request POST \
--url https://app.gtm-api.com/linkedin/v4/api/linkedin-messages/download-attachment \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--header 'Team-SID: <api-key>' \
--data '
{
"linkedin_account_sid": "<string>",
"profile_id": "<string>",
"message_id": "<string>",
"attachment_urn": "<string>"
}
'import requests
url = "https://app.gtm-api.com/linkedin/v4/api/linkedin-messages/download-attachment"
payload = {
"linkedin_account_sid": "<string>",
"profile_id": "<string>",
"message_id": "<string>",
"attachment_urn": "<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>',
profile_id: '<string>',
message_id: '<string>',
attachment_urn: '<string>'
})
};
fetch('https://app.gtm-api.com/linkedin/v4/api/linkedin-messages/download-attachment', 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/download-attachment",
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>',
'profile_id' => '<string>',
'message_id' => '<string>',
'attachment_urn' => '<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/download-attachment"
payload := strings.NewReader("{\n \"linkedin_account_sid\": \"<string>\",\n \"profile_id\": \"<string>\",\n \"message_id\": \"<string>\",\n \"attachment_urn\": \"<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/download-attachment")
.header("Authorization", "Bearer <token>")
.header("Team-SID", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"linkedin_account_sid\": \"<string>\",\n \"profile_id\": \"<string>\",\n \"message_id\": \"<string>\",\n \"attachment_urn\": \"<string>\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://app.gtm-api.com/linkedin/v4/api/linkedin-messages/download-attachment")
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 \"profile_id\": \"<string>\",\n \"message_id\": \"<string>\",\n \"attachment_urn\": \"<string>\"\n}"
response = http.request(request)
puts response.read_body{
"success": true,
"operation": "action",
"action": "<string>",
"item": "<unknown>",
"result": {
"data_url": "<string>",
"content_type": "<string>",
"file_byte_size": 123
},
"meta": {
"trace_id": "<string>",
"span_id": "<string>",
"timestamp": "<string>",
"duration_ms": 1,
"debug_url": "<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,
"debug_url": "<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,
"debug_url": "<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
Request body of download_linkedin_message_attachment.
Mailbox owner that received the message: the message row's linkedin_account_sid.
18^ln_ac_The acting account's OWN profile URN (ln_id of linkedin_account_sid from search_linkedin_accounts), not the sender's.
128Raw LinkedIn MessageId: the message row's message_hash (2-… form; the conversation id is decoded from it).
255Which attachment of that message: attachments[i].urn on the stored row (urn:li:digitalmediaAsset:…).
512Response
action success envelope.