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The Lettr Stripe App lets you send emails and templates to your customers directly from the Stripe dashboard — without leaving Stripe or writing any code.

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Prerequisites

Before you begin, make sure you have:

API Key

Create an API key in the Lettr dashboard

Verified Domain

Add and verify your sending domain
You’ll also need:
  • A Stripe account
  • A sender address on your verified domain (e.g. billing@yourdomain.com)

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Install the Lettr App

1

Install from the Stripe Marketplace

Go to the Lettr app on the Stripe Marketplace and click Install. Follow the prompts to authorize the app for your Stripe account.
2

Connect your Lettr account

Enter your Lettr API key when prompted. The app uses this to send emails on your behalf.
Use an API key with sending permissions. Never share your API key publicly. See API Key Permissions for details.

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Send Emails from Stripe

Once installed, the Lettr app appears in the sidebar when viewing a customer in Stripe. You can:
  • Send one-off emails — Compose and send an email to any customer directly from their Stripe profile
  • Use Lettr templates — Select from your saved Lettr templates and send them without leaving Stripe
  • Personalize content — Customer details from Stripe are available to personalize your emails
No webhook setup, no code, no context switching. Open a customer in Stripe, pick a template or write a message, and send.
Create reusable templates in the Lettr dashboard for common scenarios like payment reminders, onboarding sequences, or account updates. They’ll be available to select directly in Stripe.

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Other Integrations

Supabase

Auth emails and Edge Functions

WordPress

Replace wp_mail with Lettr

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What’s Next

Templates

Create reusable email templates

Sending Domains

Verify your sending domain

API Reference

Send emails programmatically via the API

Deliverability

Improve email deliverability