about connection from site to zazzle

I have an issue with my site not connecting to Zazzle shop store.  I called my site company and said they can't do nothing on their end due to they don't deal with the code from Zazzle.  I spoke to Zazzle saying that the code is working find.  But it is not working at from my website.  The message where Zazzle refused to connect. Is there a way to correct it?  here is my site here:  https://www.marcellaessentialsboutique.com/new-feature-art-designs.