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SendiMessage
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AvailableDirect HTTP API

Send messages from PHP with the SendiMessage API

PHP has an official SendiMessage SDK on Packagist: composer require sendimessage/sdk. It needs only ext-curl and ext-json — no framework dependencies — and covers the whole public API surface.

The same client works from vanilla PHP, WordPress hooks, or any framework; non-2xx responses throw an ApiException with the HTTP status and the decoded error body.

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What this integration enables

Transactional notifications
Order confirmations, payment receipts, and status changes triggered by your backend.
Appointment reminders
Scheduled jobs that message customers before a booking.
Operational alerts
Delivery windows, service updates, and internal notifications.
Two-way conversations
Incoming replies arrive on your webhook endpoint for routing to support or sales.

Architecture

How it fits together: Your application event, then PHP server code, then SendiMessage API, then Managed messaging line, then Webhook events.
  1. Your application eventAn order ships, a booking nears, a ticket updates
  2. PHP server codeBuilds the request with credentials from the environment
  3. SendiMessage APIPOST /send-message returns the queued message
  4. Managed messaging lineSMS, or iMessage on supported lines and destinations
  5. Webhook eventsDelivery status and incoming replies post back to your endpoint

Example request

PHP
<?php
// composer require sendimessage/sdk


use SendImessage\ApiException;
use SendImessage\Client;


$client = new Client(
    apiKey: getenv('SENDIMESSAGE_KEY'),
    apiSecret: getenv('SENDIMESSAGE_SECRET'),
);


try {
    $msg = $client->sendMessage(
        number: '+15555550123',
        content: 'Hello from SendiMessage',
    );
    echo $msg['message_handle'] . ' ' . $msg['status']; // 4e828182-… QUEUED
} catch (ApiException $e) {
    error_log("SendiMessage error {$e->getCode()}: {$e->getMessage()}");
    throw $e;
}

Delivery events and incoming replies

Delivery status and incoming replies arrive as signed webhook events. Verify the signature, then correlate events with your own records via the message_handle returned when you sent.

webhook event
// "outbound" event → your php endpoint
// Verify the SendiMessage-Signature header (t={timestamp},v1=HMAC-SHA256 of
// "{timestamp}.{raw body}", keyed with your webhook secret), then use
// GET /v2/messages/{message_handle} for authoritative state and match it to
// your contact_id in php.

Limitations and honest notes

  • iMessage delivery is available on supported messaging lines and destinations. Recipients without iMessage receive SMS when fallback is configured — never assume universal iMessage availability.
  • Messages are accepted asynchronously — the API returns status QUEUED and final status arrives via webhook or the message endpoints.
  • Official SDKs are published for JavaScript/TypeScript (npm: sendimessage), Python (PyPI: sendimessage), PHP (Composer: sendimessage/sdk), and Go (github.com/sendimessage/sendimessage-go). Every SDK is dependency-free and covers the full public API surface.

Security considerations

  • Load the API key pair from the environment — never commit it or embed it in client-side code.
  • Verify webhook signatures before processing events.
  • Log message handles, not message bodies, in shared logs.

Frequently asked questions

Is there an official PHP SDK for SendiMessage?
Yes — install it with `composer require sendimessage/sdk`. The SDK is dependency-free, covers the full public API (messages, media, lookup, contacts, lines, conversations, webhooks), and ships a webhook signature verification helper.
What does the API return when I send a message?
The API accepts messages asynchronously and responds with status "QUEUED" plus a message_handle and the line_handle it will send from. Track final delivery via GET /status, the message history endpoints, or webhook events.
Can I send iMessage from PHP?
SendiMessage delivers over iMessage where the destination supports it on your managed line, and falls back to SMS when fallback is configured. iMessage is never guaranteed for every recipient.

Ready to connect PHP?

Request a messaging line and a SendiMessage integration specialist will review your PHP workflow and guide the setup.