Engineering

Create a customer journey from AI coding agent

Use Courier's Journey API to create multistep customer engagement workflows from your coding agent of choice. Describe the kind of journey you'd like to create, answer a few questions, and publish to the platform.

CocoaPods end of life: here's what to do

CocoaPods has been the default iOS dependency manager for more than a decade. On December 2, 2026, its central registry becomes read-only. Here's what that actually means for native iOS, React Native, and Flutter apps.

Firebase CocoaPods support is ending. What happens to iOS push notifications?

Firebase is ending new Apple SDK releases to CocoaPods in October 2026. Your app will not break overnight, but your Firebase push notification stack can get stuck on old SDKs while APNs, iOS, Xcode, and Firebase keep changing.

Custom Environments: Ship Customer Messaging like you Ship Code

Courier workspaces now support custom environments. Each is fully isolated with its own templates, integrations, and logs. Match your messaging workflow to how you ship code.

Fonts in email: what works, what breaks, and how to fix it

Email clients don't agree on fonts. Gmail strips your custom typeface, Outlook sometimes defaults to Times New Roman, and Apple Mail handles web fonts fine. This guide covers what the industry actually does: fallback-first font stacks, progressive enhancement, readability standards, and a pre-send QA workflow

Debug Delivery Issues in Your AI Editor with MCP

Between quarterly audits, delivery issues don’t wait. When emails fail or alerts fire, you need answers fast. Courier’s MCP server lets you debug notifications conversationally—find the message, trace its timeline, and inspect user data in minutes. Instead of jumping between dashboards, your AI agent pulls everything on demand, surfaces root causes, and even automates investigations. The result: faster fixes, less guesswork, and a smarter, always-on reliability workflow.

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.

Courier MCP: Let your AI agent handle customer messaging end to end

The Courier MCP server lets your AI agent send notifications, manage users, debug delivery, and trigger automations. If you can do it in Courier, your agent can too.

iOS 27 UISceneDelegate push notification deadline: What breaks and how to prepare

Apple is making UISceneDelegate mandatory with the iOS 27 SDK, expected September 2026. Apps that don't adopt the scene lifecycle will crash on launch, killing APNs token registration and all push notification delivery. This guide covers the full timeline, cross-platform impact for Flutter and React Native, and a practical action plan.