curl --request POST \
--url https://api.blujay.io/v1/chats/{chat_id}/participants \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"handle": "+15555550123",
"from_phone_number_id": "phone_abc123"
}
'const options = {
method: 'POST',
headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
body: JSON.stringify({handle: '+15555550123', from_phone_number_id: 'phone_abc123'})
};
fetch('https://api.blujay.io/v1/chats/{chat_id}/participants', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));import requests
url = "https://api.blujay.io/v1/chats/{chat_id}/participants"
payload = {
"handle": "+15555550123",
"from_phone_number_id": "phone_abc123"
}
headers = {
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://api.blujay.io/v1/chats/{chat_id}/participants"
payload := strings.NewReader("{\n \"handle\": \"+15555550123\",\n \"from_phone_number_id\": \"phone_abc123\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Authorization", "Bearer <token>")
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))
}require 'uri'
require 'net/http'
url = URI("https://api.blujay.io/v1/chats/{chat_id}/participants")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"handle\": \"+15555550123\",\n \"from_phone_number_id\": \"phone_abc123\"\n}"
response = http.request(request)
puts response.read_body<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.blujay.io/v1/chats/{chat_id}/participants",
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([
'handle' => '+15555550123',
'from_phone_number_id' => 'phone_abc123'
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}{
"status": "success",
"trace_id": "trc_8f2a1c0e4b7d",
"timestamp": "2026-10-14T17:01:00.000Z",
"data": {
"chat_id": "chat_abc123",
"operation": "participant_add",
"status": "accepted",
"participant": {
"handle": "+15555550124",
"type": "phone",
"status": "active"
},
"from_phone_number_id": "phone_abc123"
},
"client_request_id": "<string>"
}Add a group participant
Adds a phone number or email address to an active iMessage group chat. One of your Blujay numbers in the group makes the change. If more than one of your numbers is in the group, set from_phone_number_id to choose which one.
Adding someone who is already in the group returns 200 with status: already_active. Send an Idempotency-Key so you can safely retry.
curl --request POST \
--url https://api.blujay.io/v1/chats/{chat_id}/participants \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"handle": "+15555550123",
"from_phone_number_id": "phone_abc123"
}
'const options = {
method: 'POST',
headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
body: JSON.stringify({handle: '+15555550123', from_phone_number_id: 'phone_abc123'})
};
fetch('https://api.blujay.io/v1/chats/{chat_id}/participants', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));import requests
url = "https://api.blujay.io/v1/chats/{chat_id}/participants"
payload = {
"handle": "+15555550123",
"from_phone_number_id": "phone_abc123"
}
headers = {
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://api.blujay.io/v1/chats/{chat_id}/participants"
payload := strings.NewReader("{\n \"handle\": \"+15555550123\",\n \"from_phone_number_id\": \"phone_abc123\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Authorization", "Bearer <token>")
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))
}require 'uri'
require 'net/http'
url = URI("https://api.blujay.io/v1/chats/{chat_id}/participants")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"handle\": \"+15555550123\",\n \"from_phone_number_id\": \"phone_abc123\"\n}"
response = http.request(request)
puts response.read_body<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.blujay.io/v1/chats/{chat_id}/participants",
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([
'handle' => '+15555550123',
'from_phone_number_id' => 'phone_abc123'
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}{
"status": "success",
"trace_id": "trc_8f2a1c0e4b7d",
"timestamp": "2026-10-14T17:01:00.000Z",
"data": {
"chat_id": "chat_abc123",
"operation": "participant_add",
"status": "accepted",
"participant": {
"handle": "+15555550124",
"type": "phone",
"status": "active"
},
"from_phone_number_id": "phone_abc123"
},
"client_request_id": "<string>"
}Authorizations
Your workspace API key, sent as Authorization: Bearer blu_.... Workspace admins can find it in the Blujay app under API.
An API key has full access to your workspace and works on every endpoint. There is no test mode: every key sends real messages and changes real data, so keep it secret and use it only from your server.
Each API key can make 600 read requests and 120 write requests per minute, plus 60 attachment requests per minute. Over a limit you get 429 RATE_LIMIT_EXCEEDED with Retry-After.
Headers
A unique value you choose (1–255 characters) that makes this request safe to retry. Send the same key with the same request and Blujay returns the original response instead of doing the work again. Use a new key for each new action.
Blujay keeps keys for at least 24 hours. Keys are separate for each API key and each route family (for example every POST /v1/chats/{chat_id}/messages shares one). Reusing a key with a different request returns 409 IDEMPOTENCY_REQUEST_MISMATCH. Sending it while the first request is still running returns 409 IDEMPOTENCY_IN_PROGRESS; retry shortly.
1 - 255Path Parameters
^chat_[A-Za-z0-9_-]+$"chat_abc123"
Body
from_phone_number_id picks which of your numbers makes the change. It is optional only when one of your numbers is in the group.
Response
The person was already in the group, or this Idempotency-Key was already used for the same request.
Wraps every successful response. The result is in data.
success ^trc_[A-Za-z0-9_-]+$"trc_8f2a1c0e4b7d"
"2026-10-14T17:01:00.000Z"
Show child attributes
Show child attributes
Your X-Request-ID header value, echoed back when you send one. Not included on the send responses (POST /v1/chats, POST /v1/chats/{chat_id}/messages, POST /v1/messages/{message_id}/retry); keep your own mapping from your request ID to the returned message ID there.