Problems with ecwid integration

Hello everyone

I hope someone can help me here. we have integrated a web shop from ecwid into our site. This shop was already working. Unfortunately, it hasn’t been working for about 1-2 years (we haven’t had time to take care of it until now).

the shop runs error-free on the site. But on the published page all the custom code is gone! The shopping cart does not work and the article does not load either.

I’ve tried everything I can think of.

Thanks very much