Integrations

Design Studio + Journeys: The Engineering Integration Guide

This is the engineering guide for setting up Design Studio and Journeys. When you move notification logic to Courier, your architecture shifts from a push model to an event model. Your backend stops rendering templates and managing provider APIs directly, and starts emitting events. This guide covers both integration paths (direct API and Segment), how to structure the data object so PMs can build without asking for backend changes, error handling and idempotency, how to use test environments safely, and the specific code you can delete from your repo once it's running.

Customer Engagement Orchestration: How to Unify New Messaging Channels in One Platform

Customer engagement orchestration lets you manage notifications across WhatsApp, Slack, Teams, in-app inboxes, and SMS through a single API instead of maintaining separate integrations. This guide covers why B2B companies are moving to orchestration platforms, compares modern messaging channels (including Stream Chat for marketplaces), and explains how to evaluate solutions. Includes channel comparison table and guidance on when orchestration infrastructure makes sense versus building your own.

Notification Observability: How to Monitor Delivery, Engagement, and Provider Health

Notification observability is the practice of monitoring notification delivery, engagement, and provider health using the same tools and discipline you apply to the rest of your application infrastructure. It means tracking whether messages are delivered, opened, and acted on across email, SMS, push, and in-app channels, then surfacing that data in dashboards alongside your other application metrics. Key metrics include delivery rate by channel, bounce and failure rates, provider latency, open rate trends, and click-through rates by template. Teams can build notification observability through DIY webhook handlers that pipe provider events to Datadog or Prometheus, log aggregation from application send logs, or notification platforms with built-in observability integrations. This matters most for multi-channel systems, business-critical notifications like password resets and payment confirmations, and teams using multiple providers with fallback routing.

Multichannel Notification Template Management: Version Control, Migration, and Cross-Channel Previews

AI agents are reshaping how products communicate with users. By 2026, 40% of enterprise applications will embed agents that need to send notifications across email, SMS, push, Slack, Teams, and in-app channels autonomously. Managing templates across all these channels with Git-based workflows doesn't scale. This guide covers how teams handle version control and rollback for multichannel templates, which platforms enable designer collaboration without deploys, whether Figma design systems can connect to notification builders, how to migrate templates using APIs and MCP-assisted workflows, how to preview messages across channels side-by-side, open-source options that integrate with SendGrid, Twilio, Firebase, and Slack, and how to localize content from one dashboard. Platforms covered include Courier, Novu, Knock, SuprSend, Dyspatch, Email Love, and React Email, with honest assessments of limitations for each.

Top 8 Transactional Email Solutions for Developers in 2026

Transactional emails are the messages your users are waiting for: password resets, order confirmations, shipping updates, and two-factor codes. Unlike marketing emails, they're triggered by user actions and need to arrive fast. With Gmail, Yahoo, and Microsoft now enforcing strict authentication requirements (DMARC, SPF, DKIM), choosing the right transactional email provider matters more than ever. Non-compliant emails face permanent rejection. This guide compares 8 solutions for 2026: Courier for multi-channel orchestration across email, SMS, push, and Slack. SendGrid for scale and analytics. Postmark for speed (under 2 seconds average delivery). Resend for React/Next.js teams. Amazon SES for cost-conscious AWS shops. Plus Mailgun, Mailtrap, and SMTP2GO. We cover pricing, deliverability, developer experience, and when each provider makes sense. If you're building a product where notifications will eventually span multiple channels, start with Courier. If you genuinely only need email, we break down the tradeoffs.

React Native Push Notifications: FCM, Expo, and Production-Ready

React Native lets you ship to iOS and Android from one codebase, but push notifications still require platform-specific infrastructure. This guide covers implementing push with Firebase Cloud Messaging (FCM) for bare React Native and Expo Push for managed workflows. Both get basic push working, but production apps quickly hit limitations: no delivery confirmation, no fallback channels, no user preferences, and debugging is guesswork. Learn why teams add a notification orchestration layer to handle token lifecycle, multi-channel coordination, user preferences, and delivery observability. Includes code examples for authentication, in-app inbox components, preference centers, and multi-channel routing with automatic fallbacks.

Twilio Integrations with Courier: SMS, SendGrid, Segment

Twilio owns critical notification infrastructure: SMS for billions of messages, SendGrid for email at scale, and Segment for customer data aggregation. Using them together means maintaining three APIs, three credential sets, and zero coordination between channels. Courier solves this by providing a single integration point for all three Twilio products. Connect your accounts, use one API to send across SMS and email, trigger notifications from Segment events, and orchestrate multi-channel delivery with routing rules and failover built in.

Courier + Stream: The Future of Customer Engagement is Here

Modern apps need more than features—they need conversations and intelligent communication. Courier's omnichannel notification platform combined with Stream's real-time messaging infrastructure transforms how developers build engaging experiences. Send notifications across email, SMS, push, and in-app channels while powering real-time chat, video calls, and activity feeds. With Courier's new MCP server, implement Stream directly from your IDE using AI agents. From indie developers to enterprises, build production-ready communication features in days.

How to Build a Notification Center for Web & Mobile Apps

Building a notification center from scratch takes 3-6 months. This comprehensive guide shows developers how to implement a production-ready notification center with multi-channel support in days using React, React Native, iOS, Android, Flutter, or JavaScript. Learn how to add in-app notifications, toast alerts, push notifications, email, and SMS with automatic cross-channel state synchronization. Compare building custom vs. using platforms like Courier, Novu, and OneSignal. Includes real code examples and best practices.

What is the Twilio Messaging API?

Twilio's Messaging API enables developers to send and receive SMS, MMS, WhatsApp, and RCS messages at scale across 180+ countries. While Twilio excels at reliable message delivery through carrier networks, modern applications need more than single-channel messaging. Courier acts as a provider-agnostic orchestration layer that activates messaging across Twilio and other channels from a single platform. You get intelligent routing, user preference management, and fallback logic without vendor lock-in.

How Slack Builds Smart Notification Systems Users Want

Slack's notification system serves over 42 million daily active users by balancing smart defaults with user control. Former Slack product lead Liza Gurtin and ex-Airbnb engineer Tommy Dang (Co-Founder at Mage) reveal how Slack built notification intelligence that reduces support tickets while increasing engagement. Learn how platforms like Courier enable businesses to implement Slack-level notification sophistication without custom infrastructure.

Push Notification Fallbacks: Ensuring Message Delivery with Email, Slack, SMS

Push notifications fail more often than you think - users disable them, uninstall apps, or devices go offline. Smart fallback strategies using email, SMS, and workplace chat (Slack & Microsoft Teams) ensure your critical messages always reach users. Courier's multi-channel routing automatically handles delivery failures, switching between push, email, Slack, Teams, and SMS based on your configuration. Unlike basic notification services, Courier provides intelligent timeout management, provider failover, and robust user preference management.

Top 7 Push Notification Providers in 2025

Push notifications drive real-time engagement, but managing multiple providers creates integration complexity. Courier is provider-agnostic orchestration layer for Push, Email, SMS, In-App, and Chat. We evaluated 7 top push services—FCM for universal coverage, APNS for iOS reliability, MagicBell for in-app centers, plus Airship, Pusher Beams, Expo, and AWS SNS. Most apps need multiple providers like FCM + APNS + MagicBell. Instead of custom integrations, use notification orchestration for automatic failover and unified management across email, SMS, and chat channels.

Top 6 Email Service Providers for Transactional Notifications in 2025

Comprehensive guide to the 6 best email service providers for transactional notifications in 2025. Compare SendGrid for high-volume enterprise delivery, Mailgun for developer APIs and routing control, Resend for React-based templates, AWS SES at $0.10/1000 emails for cost efficiency, Postmark with <2 second delivery for critical notifications, and SMTP for universal compatibility. Learn why most teams need multiple ESPs, how to meet new SPF/DKIM/DMARC requirements for Gmail, Yahoo, and Outlook.

Courier + Segment: A Guide to Event-Driven Messaging

Courier's native, bidirectional Twilio Segment connection enables real-time event-driven messaging with engagement feedback loops. Trigger multi-channel notifications (email, SMS, push, in-app) from Segment track events like "Trial Started" or "Feature Used." Courier sends engagement data back to Segment for behavioral analytics. Build automated workflows with drag-and-drop editor, conditional logic, and channel fallbacks. Supports SendGrid, Twilio, and native Inbox components for comprehensive notification orchestration.

How to Send an SMS in Java

Send an SMS in Java using the Courier SDK with your existing Twilio account as the provider. Complete working code, step-by-step setup, and a direct Twilio comparison for when the orchestration layer is overkill.

New Datadog integration for Courier notification logs and metrics

The ability to unify all notification metrics and logs across channels and providers into an easy-to-use dashboard is a core advantage of Courier’s notification infrastructure. However, with product notifications so critical to the entire application experience, it’s important to connect that data back to central cloud observability platforms that look across the entire stack. This gives platform engineering teams a complete understanding of application health and lets them quickly troubleshoot even the most complex issues. Today, we’re incredibly excited to announce our first observability integration with Datadog. [Datadog](https://www.datadoghq.com/) is a tool for collecting metrics and other data from applications and viewing them in a centralized place. Datadog’s dashboards and monitoring tools build a more accurate picture of the health of your application and how it changes over time. Our integration with Datadog is easy to spin up when you use our “dashboard starter kit.” This consists of some pre-configured JSON to set up a simple dashboard in Datadog for your Courier data. Our Datadog integration is currently only available on Courier’s Business plan, much like our other production-focused features such as [template analytics](https://www.courier.com/docs/platform/analytics/analytics-overview), [Okta integration for SSO](https://www.courier.com/docs/platform/workspaces/okta-integration), and [advanced user preferences](https://www.courier.com/docs/platform/preferences/preferences-overview).

New RudderStack integration: Create actionable data insights

Are you looking for a way to gain a clearer picture of your users and use that insight to improve your communication strategies? We've got some great news for you! Today, we're thrilled to announce an integration between Courier and RudderStack, a customer data platform (CDP) that allows businesses to collect, process, and route customer event data across product, marketing, and analytics tools for better decision-making. This integration builds on our recently improved integration with Segment and will further improve your ability to track your users' actions and take advantage of customer data stored in RudderStack to improve the notification experience for your users.

Smarter customer engagement flows with Courier’s new Segment integration

Courier can now be a source of events in Segment, allowing you to make the most of your multi-channel customer data. Which communications were successfully delivered? Which ones were opened and read? On what channels? These types of events generated in Courier can now be used to create custom user journeys. This step completes the integration of the two services: previously, [Segment was available as a data destination in Courier](https://www.courier.com/blog/courier-segment-integration-product-notifications). Now that the integration has come full circle, let’s have a look at how your organization can benefit from combining the two tools.

Why Are We Okay with Notification Interruptions from Slack?

The daily bombardment of alerts dinging, beeping, and ringing from all those applications we use is enough to drive someone completely crazy. Yet, for some inexplicable reason, we allow ourselves to be interrupted by Slack in a way we wouldn’t from any other platform.

The Importance of a Future-Proofed Multichannel Notification System

A future-proof multichannel notifications strategy helps you stay in touch with your users without coming off as intrusive, non-responsive, or antiquated.

Building a Slack Integration for Your SaaS Notification System

Many organizations don’t quite know what to expect when building an integration for sending messages from their SaaS product to a Slack channel or a direct message.

Courier + Segment Integration: Product Notifications In Minutes

We are excited to announce that Courier now integrates easily with Segment, the leading customer data platform! After 2.5 years and hundreds of customers, our community has convinced us that having additional event sources to act as notification triggers would help expand use cases and reduce the effort required to get up and running with Courier.

Nodemailer and the SaaS Paradox of Choice

In this blog post, we start by diving into Nodemailer, a module that helps send emails from your Node.js backend, and then we steer our way into writing a transport layer plugin that can help you switch downstream email service providers purely by configuration instead of tedious and sometimes massive code changes.

Who Knew Email Subjects Are So Complicated?

Here is our journey into email subjects upon finding out that Microsoft Outlook didn’t work with certain characters in our email subjects. Through the process, we were able to build a solution that works for multiple providers. 

The Three Things to Never Build In Your App: Authentication, Notifications, and Payments

In this post, we use Auth0’s post-user registration hook and Courier’s automations feature to learn how to help a user sign up for your product.

Follow These Considerations For An Effective Push Notification System Design

Push notifications are generally an effective mechanism for user engagement, but it's no longer enough to simple just *have* push notifications. Given increased user scrutiny and competitiveness for attention, notification system design is more important than over. We offer some guidelines on how to design effective push notifications.

How to Add a Direct Twilio SMS Integration With Sendgrid Emails

In this white paper, we share the strategies we have discovered through our work in building direct integrations and explain how to add SMS with Twilio to an existing SendGrid integration. We'll help you think through the various questions involved and set up your infrastructure.

Standardizing Message Status Across SendGrid, Twilio, Slack, Firebase, and More

I wanted to share how statuses work today in Courier and some of the things we thought through while building a single source of truth across integration providers. I’ll also explain how we provide open tracking for emails and click-through tracking across all channels.

No Code Notifications powered by Segment

Danny Douglass from our engineering team joined me for our August 12th Courier Live. We discussed a No Code approach to sending notifications using Courier as a Segment destination. It took less than 30 minutes from setup to sending our first notification.