Step 1: Click on My Apps then Get More Apps
Step 2: Click Learn More on the Mailchimp app
Step 3: Click on Connect Mailchimp
Step 4: Log in to your Mailchimp account
Step 5: Authorize Housecall Pro to access your Mailchimp account
After authorizing Housecall Pro to access Mailchimp you will see the screen below. At this point you have successfully set up the Mailchimp integration.