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Klaviyo API Authentication

How to authenticate Klaviyo API requests: one Bearer API key plus a connectionId. MindCloud stores your Klaviyo API key securely — set it once, never resend it.

Every Klaviyo API request through MindCloud needs two things: a MindCloud API Key and a connectionId for your Klaviyo account. This page covers both, plus exactly how to send them, so you do not need to visit any other page to get authenticated.

Steps to authenticate

  1. Create a MindCloud account at app.mindcloud.co if you do not already have one.
  2. Generate a MindCloud API Key in API Keys. This is the Bearer token you send on every request. Keep it on your server.
  3. Create a Klaviyo connection in Connections. Klaviyo uses an API key. You generate the key in your Klaviyo account, then paste it in when you create the connection — MindCloud stores it securely and never returns it in a response.
  4. Copy the connection’s connectionId — you will send it on every request alongside your MindCloud API Key.

How requests are authenticated

Authentication has two layers. Your MindCloud API Key authenticates the request to MindCloud, sent as a Bearer token in the Authorization header. The connectionId selects the connected Klaviyo account that should run the action. MindCloud stores and refreshes the Klaviyo credentials behind that connection, so you never send provider tokens with your requests.

Pass connectionId in the query string for GET and DELETE actions, and in the JSON body for POST, PUT, and PATCH actions.

For example, calling with an Klaviyo connection looks like this:

The Authorization: Bearer <your MindCloud API Key> header authenticates you to MindCloud; the connectionId tells MindCloud which Klaviyo account to run the action against. Missing or invalid Authorization returns 401, and a missing or mismatched connectionId returns 400.

Create a Klaviyo private API key

You need a Klaviyo account with Owner or Admin access to manage private API keys.

  1. Open API key settings in Klaviyo

    In Klaviyo, click your organization name in the lower-left, then go to Settings > API keys.

  2. Create a private API key

    Click Create Private API Key and give it a clear name for the MindCloud integration.

  3. Choose the right scopes

    Select the scopes required for the Klaviyo actions you plan to use. Custom scopes are safest when you want least-privilege access. Klaviyo does not let you edit scopes later, so create a new key if the scope set is wrong.

  4. Copy the key immediately

    Create the key and copy it right away. Klaviyo only shows the full private key once, so store it securely before leaving the page.

  5. Use the key in MindCloud

    Create the Klaviyo connection in MindCloud and paste the private key into the API key field. MindCloud will send it using Klaviyo's private-key Authorization header format.

Keep your key safe

Keep your MindCloud API Key on your server; do not ship it in browser code, mobile apps, public repositories, or logs. Anyone with the key can call the Universal API as your MindCloud account, across every connection you have created.