This plugin works very well. Simple, straightforward, does what it says.
A word of advice to anyone using an IIS server or who is hosted on Azure, this will not work without modifying php.ini. This is NOT the plugin's fault though, it is a MS issue.
The plugin throws an SSL error. To resolve the issue, you have to download the newest
cacert.pem file (just google it) and add it to your site, somewhere.
Then, follow Microsoft's instructions here to generate your own PHP runtime. (it is easier than you might think, just follow the directions, carefully)
Then add this
curl.cainfo = "D:\home\site\wwwroot\lib\cacert.pem" to your php.ini file. Make sure it points to wherever you put your file.
Be sure to activate mysqli.dll by uncommenting the line in the php.ini and make sure you have specified your php extensions directory in the php.ini.
Do all that and it should work.
I'm the developer, so take this with a grain of salt. But this plugin works great with or without Paid Memberships Pro. You simply enter your MailChimp API information, save, and then assign any of your MailChimp lists to be subscribed by your users. If you have PMPro installed, you can set different lists per membership level.
When users register for your site (or change levels), the plugin will move them into the appropriate MailChimp lists.
You can enable or disable the double opt-in. If enabled, users will receive an email to confirm their subscription to the list. If not, they are just added to the list. Be careful if you don't use double opt-in, as too many "spam" ticks on your emails could result in penalties against your MailChimp account. However, if you have a very clear membership site and users expect your emails, you don't need to bug them with yet another confirmation email.
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