Mailchimp OAuth 2.0 connector profile – StackOne setup guide

Sign in to your Mailchimp account with Admin or Owner permissions.

From your Mailchimp account page:

• Navigate to your account settings (Account & billing).
• Click on Extras in the top navigation menu.
• Select Registered Apps from the dropdown menu.

On the Registered Apps page:

• Click the Register An App button.
• Fill in the required fields - App name (e.g., “StackOne Integration”), App description, Company/organization, and App website.
• Optionally upload a logo (JPG, GIF, or PNG, up to 1MB).
• Enter the Redirect URI https://api.stackone.com/connect/oauth2/mailchimp/callback.
• Click Create to generate your application.

After creating the app:

• Copy the Client ID from the app details page.
• Copy the Client Secret and store it securely.
• The Client Secret is displayed once - save it immediately.

After OAuth authorization completes:

• The server prefix is retrieved automatically from the OAuth metadata endpoint at https://login.mailchimp.com/oauth2/metadata.
• The metadata response includes the datacenter prefix (e.g., us1, us19).

You can also find your server prefix:

• Look at your Mailchimp account URL when logged in (e.g., https://us19.admin.mailchimp.com).
• The prefix is the subdomain before .admin.mailchimp.com (e.g., “us19”).