Webhooks overview

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Webhooks push events to your server the moment they happen — no polling. Each event type goes to its own URL, configured per workspace.

Event types

Type	Fires when
`impression`	SMS accepted by the gateway (API sends)
`click`	Recipient clicks a short URL (optional per-recipient dedup)
`conversion`	Postback received via `/track` or createAction
`delivery`	Carrier returns a delivery report (DLR)

Configure

In the portal under Webhooks, or via API:

PUT /api/v1/user/webhooks · Permission: webhooks.write

curl -X PUT https://restlink23telecom.com/api/v1/user/webhooks \
  -H "X-API-Key: $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "delivery_url": "https://your-server.com/webhook/delivery",
  "click_url": "https://your-server.com/webhook/click",
  "unique_clicks_only": true,
  "delivery_fields": [
    "message_id",
    "recipient",
    "sender_id",
    "status",
    "status_code",
    "num_parts",
    "cost",
    "timestamp"
  ]
}'

const res = await fetch('https://restlink23telecom.com/api/v1/user/webhooks', {
  method: 'PUT',
  headers: { 'X-API-Key': process.env.API_KEY, 'Content-Type': 'application/json' },
  body: JSON.stringify({
    "delivery_url": "https://your-server.com/webhook/delivery",
    "click_url": "https://your-server.com/webhook/click",
    "unique_clicks_only": true,
    "delivery_fields": [
      "message_id",
      "recipient",
      "sender_id",
      "status",
      "status_code",
      "num_parts",
      "cost",
      "timestamp"
    ]
  }),
});

if (!res.ok) {
  const err = await res.json();
  throw new Error(`${err.error_code}: ${err.description}`);
}
const data = await res.json();
console.log(data);

import os
import requests

res = requests.put(
    "https://restlink23telecom.com/api/v1/user/webhooks",
    headers={"X-API-Key": os.environ["API_KEY"]},
    json={
        "delivery_url": "https://your-server.com/webhook/delivery",
        "click_url": "https://your-server.com/webhook/click",
        "unique_clicks_only": True,
        "delivery_fields": ["message_id", "recipient", "sender_id", "status", "status_code", "num_parts", "cost", "timestamp"]
    },
)
res.raise_for_status()
print(res.json())

<?php
$ch = curl_init('https://restlink23telecom.com/api/v1/user/webhooks');
curl_setopt_array($ch, [
    CURLOPT_CUSTOMREQUEST  => 'PUT',
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER     => ['X-API-Key: ' . getenv('API_KEY'), 'Content-Type: application/json'],
    CURLOPT_POSTFIELDS     => json_encode([
        'delivery_url' => 'https://your-server.com/webhook/delivery',
        'click_url' => 'https://your-server.com/webhook/click',
        'unique_clicks_only' => true,
        'delivery_fields' => ['message_id', 'recipient', 'sender_id', 'status', 'status_code', 'num_parts', 'cost', 'timestamp']
    ]),
]);

$response = curl_exec($ch);
$status   = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);

if ($status !== 200) {
    throw new Exception("HTTP $status: $response");
}
$data = json_decode($response, true);
print_r($data);

require "net/http"
require "json"

uri = URI("https://restlink23telecom.com/api/v1/user/webhooks")
req = Net::HTTP::Put.new(uri)
req["X-API-Key"] = ENV.fetch("API_KEY")
req["Content-Type"] = "application/json"
req.body = {
  delivery_url: "https://your-server.com/webhook/delivery",
  click_url: "https://your-server.com/webhook/click",
  unique_clicks_only: true,
  delivery_fields: ["message_id", "recipient", "sender_id", "status", "status_code", "num_parts", "cost", "timestamp"]
}.to_json

res = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |http| http.request(req) }
raise "HTTP #{res.code}: #{res.body}" unless res.is_a?(Net::HTTPSuccess)

puts JSON.parse(res.body)

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

HttpClient client = HttpClient.newHttpClient();

HttpRequest request = HttpRequest.newBuilder()
    .uri(URI.create("https://restlink23telecom.com/api/v1/user/webhooks"))
    .header("X-API-Key", System.getenv("API_KEY"))
    .header("Content-Type", "application/json")
    .PUT(HttpRequest.BodyPublishers.ofString("""
        {
          "delivery_url": "https://your-server.com/webhook/delivery",
          "click_url": "https://your-server.com/webhook/click",
          "unique_clicks_only": true,
          "delivery_fields": [
            "message_id",
            "recipient",
            "sender_id",
            "status",
            "status_code",
            "num_parts",
            "cost",
            "timestamp"
          ]
        }"""))
    .build();

HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
System.out.println(response.body());

package main

import (
  "fmt"
  "io"
  "net/http"
  "os"
  "strings"
)

func main() {
  payload := strings.NewReader(`{
  "delivery_url": "https://your-server.com/webhook/delivery",
  "click_url": "https://your-server.com/webhook/click",
  "unique_clicks_only": true,
  "delivery_fields": [
    "message_id",
    "recipient",
    "sender_id",
    "status",
    "status_code",
    "num_parts",
    "cost",
    "timestamp"
  ]
}`)

  req, err := http.NewRequest("PUT", "https://restlink23telecom.com/api/v1/user/webhooks", payload)
  if err != nil {
    panic(err)
  }
  req.Header.Set("X-API-Key", os.Getenv("API_KEY"))
  req.Header.Set("Content-Type", "application/json")

  res, err := http.DefaultClient.Do(req)
  if err != nil {
    panic(err)
  }
  defer res.Body.Close()

  data, _ := io.ReadAll(res.Body)
  fmt.Println(string(data))
}

using System.Text;

using var client = new HttpClient();
client.DefaultRequestHeaders.Add("X-API-Key",
    Environment.GetEnvironmentVariable("API_KEY"));

var json = """
{
  "delivery_url": "https://your-server.com/webhook/delivery",
  "click_url": "https://your-server.com/webhook/click",
  "unique_clicks_only": true,
  "delivery_fields": [
    "message_id",
    "recipient",
    "sender_id",
    "status",
    "status_code",
    "num_parts",
    "cost",
    "timestamp"
  ]
}
""";
var content = new StringContent(json, Encoding.UTF8, "application/json");
var response = await client.PutAsync("https://restlink23telecom.com/api/v1/user/webhooks", content);

response.EnsureSuccessStatusCode();
Console.WriteLine(await response.Content.ReadAsStringAsync());

Validation errors

PUT /user/webhooks returns 400 with stable typed codes:

Code	When
`INVALID_URL`	URL is not a string or fails SSRF validation (`""`/`null` are valid — they disable the channel)
`INVALID_SECRET`	`signing_secret` empty, longer than 64 chars, or wrong type
`INVALID_FIELDS`	`*_fields` is null, empty, or contains an unknown field name
`INVALID_TOGGLE`	`unique_clicks_only` is not a boolean
`CONFLICTING_FIELDS`	`signing_secret` and `clear_signing_secret: true` sent together
`INVALID_BODY`	JSON parse error

Choose your payload fields

You pick which fields each webhook carries (defaults shown in the example above). The full field list per event is in delivery webhook. workspace_id is opt-in for every event type — add it to the relevant *_fields list if you route multiple workspaces to one receiver.

Click dedup (`unique_clicks_only`)

When true, the click webhook fires only on the first human click per (broadcast, recipient) pair; repeat clicks are skipped. Bot clicks never fire webhooks. Applies to broadcast links only — API auto-shortened links always deliver every human click.

Test & inspect

POST /api/v1/user/webhooks/test · Permission: webhooks.write

curl -X POST https://restlink23telecom.com/api/v1/user/webhooks/test \
  -H "X-API-Key: $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "type": "delivery"
}'

const res = await fetch('https://restlink23telecom.com/api/v1/user/webhooks/test', {
  method: 'POST',
  headers: { 'X-API-Key': process.env.API_KEY, 'Content-Type': 'application/json' },
  body: JSON.stringify({
    "type": "delivery"
  }),
});

if (!res.ok) {
  const err = await res.json();
  throw new Error(`${err.error_code}: ${err.description}`);
}
const data = await res.json();
console.log(data);

import os
import requests

res = requests.post(
    "https://restlink23telecom.com/api/v1/user/webhooks/test",
    headers={"X-API-Key": os.environ["API_KEY"]},
    json={
        "type": "delivery"
    },
)
res.raise_for_status()
print(res.json())

<?php
$ch = curl_init('https://restlink23telecom.com/api/v1/user/webhooks/test');
curl_setopt_array($ch, [
    CURLOPT_CUSTOMREQUEST  => 'POST',
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER     => ['X-API-Key: ' . getenv('API_KEY'), 'Content-Type: application/json'],
    CURLOPT_POSTFIELDS     => json_encode([
        'type' => 'delivery'
    ]),
]);

$response = curl_exec($ch);
$status   = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);

if ($status !== 200) {
    throw new Exception("HTTP $status: $response");
}
$data = json_decode($response, true);
print_r($data);

require "net/http"
require "json"

uri = URI("https://restlink23telecom.com/api/v1/user/webhooks/test")
req = Net::HTTP::Post.new(uri)
req["X-API-Key"] = ENV.fetch("API_KEY")
req["Content-Type"] = "application/json"
req.body = {
  type: "delivery"
}.to_json

res = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |http| http.request(req) }
raise "HTTP #{res.code}: #{res.body}" unless res.is_a?(Net::HTTPSuccess)

puts JSON.parse(res.body)

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

HttpClient client = HttpClient.newHttpClient();

HttpRequest request = HttpRequest.newBuilder()
    .uri(URI.create("https://restlink23telecom.com/api/v1/user/webhooks/test"))
    .header("X-API-Key", System.getenv("API_KEY"))
    .header("Content-Type", "application/json")
    .POST(HttpRequest.BodyPublishers.ofString("""
        {
          "type": "delivery"
        }"""))
    .build();

HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
System.out.println(response.body());

package main

import (
  "fmt"
  "io"
  "net/http"
  "os"
  "strings"
)

func main() {
  payload := strings.NewReader(`{
  "type": "delivery"
}`)

  req, err := http.NewRequest("POST", "https://restlink23telecom.com/api/v1/user/webhooks/test", payload)
  if err != nil {
    panic(err)
  }
  req.Header.Set("X-API-Key", os.Getenv("API_KEY"))
  req.Header.Set("Content-Type", "application/json")

  res, err := http.DefaultClient.Do(req)
  if err != nil {
    panic(err)
  }
  defer res.Body.Close()

  data, _ := io.ReadAll(res.Body)
  fmt.Println(string(data))
}

using System.Text;

using var client = new HttpClient();
client.DefaultRequestHeaders.Add("X-API-Key",
    Environment.GetEnvironmentVariable("API_KEY"));

var json = """
{
  "type": "delivery"
}
""";
var content = new StringContent(json, Encoding.UTF8, "application/json");
var response = await client.PostAsync("https://restlink23telecom.com/api/v1/user/webhooks/test", content);

response.EnsureSuccessStatusCode();
Console.WriteLine(await response.Content.ReadAsStringAsync());

GET /api/v1/user/webhooks/logs · Permission: webhooks.read

curl "https://restlink23telecom.com/api/v1/user/webhooks/logs?limit=10" \
  -H "X-API-Key: $API_KEY"

const res = await fetch('https://restlink23telecom.com/api/v1/user/webhooks/logs?limit=10', {
  method: 'GET',
  headers: { 'X-API-Key': process.env.API_KEY },
});

if (!res.ok) {
  const err = await res.json();
  throw new Error(`${err.error_code}: ${err.description}`);
}
const data = await res.json();
console.log(data);

import os
import requests

res = requests.get(
    "https://restlink23telecom.com/api/v1/user/webhooks/logs",
    headers={"X-API-Key": os.environ["API_KEY"]},
    params={
        "limit": 10
    },
)
res.raise_for_status()
print(res.json())

<?php
$ch = curl_init('https://restlink23telecom.com/api/v1/user/webhooks/logs?limit=10');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER     => ['X-API-Key: ' . getenv('API_KEY')],
]);

$response = curl_exec($ch);
$status   = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);

if ($status !== 200) {
    throw new Exception("HTTP $status: $response");
}
$data = json_decode($response, true);
print_r($data);

require "net/http"
require "json"

uri = URI("https://restlink23telecom.com/api/v1/user/webhooks/logs?limit=10")
req = Net::HTTP::Get.new(uri)
req["X-API-Key"] = ENV.fetch("API_KEY")

res = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |http| http.request(req) }
raise "HTTP #{res.code}: #{res.body}" unless res.is_a?(Net::HTTPSuccess)

puts JSON.parse(res.body)

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

HttpClient client = HttpClient.newHttpClient();

HttpRequest request = HttpRequest.newBuilder()
    .uri(URI.create("https://restlink23telecom.com/api/v1/user/webhooks/logs?limit=10"))
    .header("X-API-Key", System.getenv("API_KEY"))
    .GET()
    .build();

HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
System.out.println(response.body());

package main

import (
  "fmt"
  "io"
  "net/http"
  "os"
)

func main() {
  req, err := http.NewRequest("GET", "https://restlink23telecom.com/api/v1/user/webhooks/logs?limit=10", nil)
  if err != nil {
    panic(err)
  }
  req.Header.Set("X-API-Key", os.Getenv("API_KEY"))

  res, err := http.DefaultClient.Do(req)
  if err != nil {
    panic(err)
  }
  defer res.Body.Close()

  data, _ := io.ReadAll(res.Body)
  fmt.Println(string(data))
}

using System.Text;

using var client = new HttpClient();
client.DefaultRequestHeaders.Add("X-API-Key",
    Environment.GetEnvironmentVariable("API_KEY"));

var response = await client.GetAsync("https://restlink23telecom.com/api/v1/user/webhooks/logs?limit=10");

response.EnsureSuccessStatusCode();
Console.WriteLine(await response.Content.ReadAsStringAsync());

Logs include the payload sent, response code, response time and error details for every delivery attempt.

Delivery webhook — payload, retries, receiver examples
Securing webhooks — HMAC signatures, secret rotation
Tracker postbacks — conversion ingestion and URL placeholders