Thanks for dropping by the Seller Community, @Shana1!
I checked our App Marketplace for a partnership with Constant Contact, but it looks like we aren't officially supporting an integration with them at this time. I also took a peek on the Constant Contact integration list, but we aren't mentioned there currently.
You may want to try searching on Google for a way to integrate or sync Square with your Constant Contact account. I know there are services that help support unofficial integrations, like Zapier - that may be worth looking into!
I also want to throw in here that Square offers marketing services, if you haven't seen that yet. You can learn more about Square Marketing here - this may be a good fit for you if you're already using Square Appointments for your business!
Valentina
Community Moderator, Square
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