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Connect Lettr

1 auth method · updated 2026-10-01

Lettr is an email and messaging platform for transactional delivery, templates, audiences, campaigns, domains, and webhooks.

lettr.com ↗

API key

Uses your own credential — Verslay stores it encrypted

Connectable today
  1. 1
    Sign in to Lettr
    Open https://lettr.com and sign in to the account you want to connect.
  2. 2
    Create the API key
    Open https://docs.lettr.com/learn/api-keys/introduction and generate a new API key.
  3. 3
    Copy it immediately
    Lettr usually shows the full API key only once, right after you create it. Store it somewhere safe before closing the page.
  4. 4
    Connect in Verslay
    In the Verslay Hub, open Connections, find Lettr, and paste the API key into the API Key field.
  5. 5
    Verify
    The connection flips to Connected. Run any read-only action once to confirm the credential has the right scopes.
  6. 6
    Rotate safely
    When you rotate later: connect the new credential first, confirm it works, then revoke the old one.

What you’ll paste into Verslay

API Key

Create a live Full Access API key in the Lettr dashboard under Settings > API Keys (https://app.lettr.com/api-keys). The complete key, beginning with lttr_, is shown only once, so copy it when it is created. Do not use a sandbox or Sending

required · secret
Get your credential ↗Lettr website ↗

Lettr connection FAQ

How do I connect Lettr to Verslay?

Open Connections in the Verslay Hub, find Lettr, and use the API key method. The steps are: Sign in to Lettr, Create the API key, Copy it immediately, Connect in Verslay, Verify, Rotate safely.

What do I need before I connect Lettr?

You need API Key from your Lettr account. Create a live Full Access API key in the Lettr dashboard under Settings > API Keys (https://app.lettr.com/api-keys). The complete key, beginning with lttr_, is shown only once, so copy it when it is created. Do not use a sandbox or Sending

Related connection guides

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