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Yousign API Authentication

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

Every Yousign API request through MindCloud needs two things: a MindCloud API Key and a connectionId for your Yousign 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 Yousign connection in Connections. Yousign uses an API key. You generate the key in your Yousign 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 Yousign account that should run the action. MindCloud stores and refreshes the Yousign 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 Get Default Workspace with an Yousign connection looks like this:

curl --request POST \
  --url "https://connect.mindcloud.co/v2/universal/apps/yousign/actions/get-default-workspace/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 Yousign account to run the action against. Missing or invalid Authorization returns 401, and a missing or mismatched connectionId returns 400.

Connect your Yousign API key

You need a Yousign account with an active API trial or subscription. Only Yousign users with an Admin or Owner role can create API keys.

  1. Open API keys in Yousign

    In the Yousign app, open the right panel and go to API > API keys. If your API trial is not active yet, start it from this page.

    API → API keys

  2. Create a sandbox API key

    Create a new API key for the Sandbox environment. Choose Full-Access if you want MindCloud to create, update, or delete Yousign resources during testing.

  3. Copy the API key into MindCloud

    Copy the API key from Yousign and paste it into the MindCloud connection when prompted.

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.

Yousign API Authentication - Universal API