Wix

The code cannot be pasted into Wix. Its Embed HTML element runs code from a shared Wix address that every Wix site uses. Your key refuses that address, so that no other site can use it.

What to do

1. Ask PlanWise to open your venue’s page on plan-wise.org.
2. Add a button to your Wix site that links to that page.

More about that page: A venue page instead of a website.