giving this error
You must provide a MailChimp API key
Thank you contact us Nikhil
You need to follow step 1.
You require to create MailChimp account and get mailchimp key and on .env file:
In the website tutorial mentioned above, you haven't added the command for publishing the vendor. It wasn't until I looked at the GitHub page where you mention:
php artisan vendor:publish --provider="Skovmand\Mailchimp\MailchimpServiceProvider"
This made the difference for me, as there was no access to the mailchimp api key variable in .env
Great work on this package though!!!