MailChimp subscribe with PHP via MailChimp API 3.0

Simply class for add or remove email address to MailChimp address list

Requires

MailChimp API key and address list ID

Create API key

Log in to your MailChimp account, go to your Profile / Extras / API keys, and click the "Create a key" button

Get list ID

Go to your address list (or create new list) / Settings / List name and defaults

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Minimum PHP version: 5.2.0