> ## Documentation Index
> Fetch the complete documentation index at: https://docs.lettr.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Stripe Email Integration

> Install the Lettr Stripe app to send emails and saved templates to customers directly from the Stripe dashboard, with no code required.

The [Lettr Stripe App](https://marketplace.stripe.com/apps/lettr) lets you send emails and templates to your customers directly from the Stripe dashboard — without leaving Stripe or writing any code.

## Prerequisites

Before you begin, make sure you have:

<CardGroup cols={2}>
  <Card title="API Key" icon="key" href="https://app.lettr.com/api-keys">
    Create an API key in the Lettr dashboard
  </Card>

  <Card title="Verified Domain" icon="globe" href="/learn/domains/sending-domains">
    Add and verify your sending domain
  </Card>
</CardGroup>

You'll also need:

* A [Stripe](https://stripe.com) account
* A sender address on your verified domain (e.g. `billing@yourdomain.com`)

## Install the Lettr App

<Steps>
  <Step title="Install from the Stripe Marketplace">
    Go to the [Lettr app on the Stripe Marketplace](https://marketplace.stripe.com/apps/lettr) and click **Install**. Follow the prompts to authorize the app for your Stripe account.
  </Step>

  <Step title="Connect your Lettr account">
    Enter your Lettr API key when prompted. The app uses this to send emails on your behalf.

    <Warning>
      Use an API key with sending permissions. Never share your API key publicly. See [API Key Permissions](/learn/api-keys/permissions) for details.
    </Warning>
  </Step>
</Steps>

## 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.

<Tip>
  Create reusable templates in the [Lettr dashboard](https://app.lettr.com/templates) for common scenarios like payment reminders, onboarding sequences, or account updates. They'll be available to select directly in Stripe.
</Tip>

## Other Integrations

<CardGroup cols={2}>
  <Card title="Supabase" icon="bolt" href="/integrations/supabase">
    Auth emails and Edge Functions
  </Card>

  <Card title="WordPress" icon="wordpress" href="/integrations/wordpress">
    Replace wp\_mail with Lettr
  </Card>
</CardGroup>

## What's Next

<CardGroup cols={2}>
  <Card title="Templates" icon="paintbrush" href="/learn/templates/introduction">
    Create reusable email templates
  </Card>

  <Card title="Sending Domains" icon="globe" href="/learn/domains/sending-domains">
    Verify your sending domain
  </Card>

  <Card title="API Reference" icon="code" href="/api-reference/emails/send-email">
    Send emails programmatically via the API
  </Card>

  <Card title="Deliverability" icon="chart-line" href="/knowledge-base/best-practices/deliverability">
    Improve email deliverability
  </Card>
</CardGroup>