Customer.io
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  • Features
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    • Getting Started: Overview
    • Getting Started: What is Customer.io?
    • Getting Started: People
    • Getting Started: Segments
    • Getting Started: Campaigns and Broadcasts
    • Getting Started: Workspaces
    • Getting Started: Integration Planning
    • Getting Started: Integration Methods
        • How we Bill
        • How we Bill: Basic Subscription
        • How we Bill: Premium Subscription
        • Payment Problems
        • Canceling Your Account
      • Editing Account Information
      • Adding Team Members to Your Account
      • Finding and managing your API credentials
      • Security Best Practices
      • Two-Factor Authentication
      • Single Sign-on (SSO)
      • Account Regions (US and EU)
    • Account Verification
    • Create a HAR file for help troubleshooting
    • Customer.io, GDPR, and you!
    • Security
    • Privacy
    • Date and Time Data in Customer.io
    • Workspaces in Customer.io
    • Tags
    • Add and Update People
    • User Attributes
    • Events
    • Anonymous Events
    • Resolve duplicate people
    • What's the Last Visited field, and how do I use it?
    • Adding/Updating People Manually
    • Adding/Updating People via CSV
    • Searching and filtering people
    • Exporting Data for a Single Person
    • Exporting Data for Many People
    • Deleting People and Suppressing Profile IDs
    • Filtering Your Activity Logs
    • Managing Customer Mobile Devices
    • Using your data index
    • How do I know what data I have available?
    • How do I create multiple subscription types?
    • Segments
    • Ad Audiences
    • Timestamp Conditions
    • Timestamp Conditions FAQ
    • Timestamp Rules for Building Segments
    • Why aren't users matching my 'within the past X days' condition?
    • Messaging Types: Campaigns, Broadcasts, and Transactional Messages
    • Making changes to campaigns and broadcasts
      • Campaigns in Customer.io
      • The Difference between Triggers and Filters
      • A/B testing campaign messages
      • Tagging & Organizing Your Campaigns
      • Pausing an Active Campaign
      • Broadcasts in Customer.io
      • Using API Triggered Broadcast data in your messages
      • API Triggered Broadcasts - Common API errors
      • API Triggered Broadcasts - Formatting Broadcast Data
      • Transactional API
      • Transactional API - Examples
      • Transactional API - Common API errors
        • How We Deliver Your Email
        • Introduction to Creating Emails
        • Choosing the Right Email Editor
        • Drag-and-Drop Emails: The Basics
        • Drag-and-Drop Editor FAQ
        • Troubleshooting Your Drag-and-Drop Emails
        • Customizing Email Layouts
        • Archiving Old Layouts
        • Adding a view in browser link
        • How do I add an avatar/logo to my emails?
        • Disable CSS pre-processing
        • Set Custom Email Headers
        • Set custom preheader/preview text
        • Testing Your Emails
        • What does the Fake BCC option do?
        • Create Multiple From Addresses
        • Introduction to Email Layouts
        • HTML and CSS Email vs. Web
        • Resources for templates, code, and best practices
        • Adapting Foundation's Basic template
        • Adapting MailChimp's Two-Column template
        • Getting started with push notifications
        • Push notification integration guide
        • Custom push payloads
        • Tracking push notifications
        • Testing your push notifications
        • FAQ about push notifications
        • Push notifications and React Native
        • Twilio SMS - Getting Started
        • Twilio SMS - Tracking
        • Twilio SMS - FAQ
        • SMS opt out keywords
        • Send WhatsApp Messages
        • Slack Messages - Getting Started
        • Webhooks - Getting Started
        • Send in-app messages using webhooks
        • Web push with webhooks
        • Delivery Time Window
        • Wait Until...
        • Attribute Update - Getting Started
        • How-to: Use Attribute Updates to Fix Typos in Your Data
        • How-to: Use Attribute Updates to Reformat Timestamps
      • Branches
      • Visual Workflow Builder
      • Action Conditions
      • Grace Periods
      • Copying Workflow Items
      • Why wasn't my customer sent a message from my campaign?
      • Liquid tag list
      • Personalizing Your Messages With Liquid
      • Reusing Content With Snippets
      • Collections
      • Composer errors
      • Email Deliverability Best Practices
      • Domain Authentication
      • Email suppression lists
      • Deliverability Dos and Don'ts
        • Use Your Own SMTP Server
        • Using Multiple SMTP servers
        • Use your Mailgun Account
        • Use your Mailjet Account
        • Use your Mandrill Account
        • Use your Postmark Account
        • Use your SendGrid Account
        • Use your Sparkpost Account
        • Use your Oracle Dyn Account
    • Find messages using the message library
    • Image requirements
    • Sending Behavior
    • How To Use Drafts To Deliver Error Free Messages
    • Queue Draft for Campaign QA
    • Adding URL parameters to links
    • Checking Link Status
    • Link Tracking
    • Unsubscribes
    • Message Statuses
    • Send messages in users' time zones with Time Zone Match
    • Time Zone Formats Supported in Customer.io
    • My message is showing as attempted/failed! Why?
    • Message Limits
    • Messages in different or multiple languages
    • Metrics
    • Campaign Metrics
    • Getting conclusive results from A/B tests
    • Understanding your A/B test results
      • Use our JavaScript snippet
      • Track page views
      • Set Up Universal Links
      • Sync people from a database
      • Segment: Customer.io as a data destination
      • Backfill historical data
      • HTTPS Link Tracking
      • Zoho integration
      • mParticle integration
      • Segment: Customer.io as a data Source
      • Data Warehouse Sync
      • Mixpanel or KISSMetrics
      • Reporting Webhooks
      • Data Warehouse integration using Stitch
      • Facebook Lead Ads integration
      • Custom forms integration
      • Use Google Forms, Jotform, and Typeform with Zapier
    • API Reference
    • Reporting Webhook Reference
    • Integration Libraries
    • Invalid API Requests
    • Using Customer.io with Rails
    • Send a Welcome Email
    • Welcome Email Copy
    • Birthday and Anniversary Campaigns
    • Cart Abandonment
    • Double Opt-In
    • Onboarding Campaign
    • Send a Transactional Message
    • Trial expiration reminders
    • Assign a personal support rep
    • Setting Up Segments for Specific Purposes
    • Setting up Blackhole/Holdout Testing
    • Setting up Cohort Testing
    • Enable Time Zone Match in 10 Minutes with Clearbit
    • Personalize Campaigns Based on Roles
    • RSS Feed Email Campaign
    • Invite Emails
    • Anonymous Invite Emails
    • Gmail Promotions
    • Send data from Customer.io to Salesforce, Highrise or another CRM
    • Validate mobile phone numbers
    • Setting up and using Zapier with Customer.io
    • Reminders for multiple upcoming trips
    • Collect emails on Twitter
    • Verify deliverable email addresses with Kickbox
Release Notes

New Users

Get Started

Learn about Customer.io and start using the platform

Add People

Identify the people you want to send messages to

Send a Message

Set up your first campaign and send messages

Advanced Users

Add Message Types

Send SMS, push, and Slack notifications

Use Liquid

Personalize messages with data in or out of Customer.io

Set up Webhooks

Call an API and incorporate outside data in your campaigns

Developers

Rest API

Write your own back-end integration

Use a Library

Use our JS snippet or libraries to facilitate your integration

Integrations

Get data from, and send data to, your backend systems
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