Before Configuration and Integrate Mailchimp with Magento 2, First, you must have installed the Mailchimp extension in your project.
To Synchronise Mailchimp with Magento facilitate the subscription to the Newsletter for the customer and get the service of Mailchimp that will provide a lot of other additional services to the Magento platform.
How to configure Mailchimp in Magento 2?
To Enable Mailchimp from Magento, Just log in with your credentials to the Admin Panel,
Now Click on the left sidebar Menu Option,
1) Mailchimp -> Configuration,
2) From the Mailchimp General Configuration Section,
Choose Yes from the Enabled Field. You can see the above screenshot for reference to the enabled option.
3) Click on the Get API Credentials, and a new popup opens from Mailchimp,
You can see the final step of Popup from the Mailchimp API key as looks like the given screenshot.
4) After inserting the API key to the configuration, you need to click the top right button Save Config to save our changes.
This is the process to connect a Mailchimp account with Magento. you can use the subscription feature of Mailchimp in Magento by following the above steps.