I only have a basic ($5.00/mth) plan. Can I add a Mail Chimp app with this or do I have to upgrade to a premium subscription.
If you are talking about the MailChimp API then yes you can use it. If you are talking about the app from the Wix App Market which does not require Corvid then you should get in touch with Wix Support as they will be able to help you best.
I went to Market Integrations where I found I could integrate with Mail Chimp there. Once I tried to connect, it asks for me to purchase a plan. I haven’t done that yet because I first want to see if I like Wix (currently a Word Press guy). So it looks like I need to buy a plan for this to work. Wondering if the cheapest plan will allow me to do the MailChimp integration or if I have to buy a Premium Plan.
You should be contacting Wix Support for this because this is a forum for Corvid where we focus on code issues. Other issues should be directed to Wix Support as they are in a position to help you best.