Generate an API key
An API key authenticates requests to the Close API on behalf of your user account.
Sign in to Close
Open Developer settings
In the Settings menu, under CONNECT, click Developer. The API Keys tab opens.

Create a new API key
On the API Keys tab, click + New API Key.

Enter a name for the key
In the New API Key dialog, enter a descriptive name in API key name (e.g., StackOne Integration), then click Create API Key.

Copy the API key
Hover over the key and click the Copy to clipboard icon at the right end of the field, then store the key securely for use later.
- The key is shown only once — it cannot be displayed again after closing the dialog.
- Format:
api_XXXXXXXXXXXXXXXX.XXXXXXXXXXXXXXXX(the key contains the ID and a secret part separated by a period)

Link the Account
Connect
- Click Connect.
- If applicable, the provider will redirect you to a sign-in or authorization page. Complete the provider’s authorization flow.
- Once authorization is successful, you will see a confirmation popup.
Use Actions
Next Steps
Webhooks setup
Configure receiving Events for Close into StackOne.
