Go to Mailchimp's website
Click on "Log In" in the top right corner
Enter your email and password to access your account
Once logged in, click on your profile icon in the bottom left corner of the dashboard
From the dropdown menu, select "Account & billing"
In the Account dashboard, look for the "Extras" menu
Click on "API keys"
If you don't have any API keys yet, you'll see a message about creating your first key
Click on the "Create A Key" button
Mailchimp will ask you to name your key (e.g., "Allsource")
Click "Generate Key" to create your API key
Once generated, your API key will appear as a long string of letters and numbers
Click the "Copy" button next to the key to copy it to your clipboard
⚠️ Important: Store this key securely as Mailchimp won't show it to you again in full after you leave this page
Go to Allsource Integrations page
Press on Mailchimp icon
Paste the API key into the designated field.
Click "Connect".