beehiiv API Authentication

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

Every beehiiv API request through MindCloud needs two things: a MindCloud API Key and a connectionId for your beehiiv 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

Create a MindCloud account at app.mindcloud.co if you do not already have one.
Generate a MindCloud API Key in API Keys. This is the Bearer token you send on every request. Keep it on your server.
Create a beehiiv connection in Connections. beehiiv uses an API key. You generate the key in your beehiiv account, then paste it in when you create the connection — MindCloud stores it securely and never returns it in a response.
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 beehiiv account that should run the action. MindCloud stores and refreshes the beehiiv 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 List Publications with an beehiiv connection looks like this:

curl --request POST \
  --url "https://connect.mindcloud.co/v2/universal/apps/beehiiv/actions/list-publications/run" \
  --header "Authorization: Bearer $MINDCLOUD_API_KEY" \
  --header "Content-Type: application/json" \
  --data '{
  "connectionId": "$CONNECTION_ID",
  "arguments": {}
}'

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

Create a beehiiv API key

You must be an Owner or Admin in beehiiv to access API keys, and beehiiv requires account verification through Stripe Identity Verification before API access can be enabled.

Open the API settings in beehiiv
In your beehiiv account, open Settings, then select API under Workspace Settings.
Settings → Workspace Settings → API
Create the API key
Click Create New API Key. If beehiiv asks you to verify your identity, complete that verification flow first.
Name the key and save it securely
Enter a name for the new API key, create it, then copy the key immediately and store it somewhere secure. beehiiv only shows the full key once.
Paste the key into MindCloud
Return to the MindCloud beehiiv connection form and paste the copied API key into the API key field.

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.