Problems after Moving site to new Server

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I am trying to help a local e-commerce shop who moved their site to a new server and then the ecommerce plugin stopped working about 2 weeks later and Started spitting out:

Coupon code expired.
Invalid coupon code.

It's currently running version 5.6.1 of Concrete5 and eCommerce - 2.8.9

http://domacoffee.com

I've scoured for solutions to this and haven't found anything.

It's also having an issue connecting to the community and I followed the guide to delete the 2 keys in the config table but even after deleting the cache a bunch of times it still won't connect. Not sure if the issues are related.