whipkey

I was able to resolve it. I had to place the previous HTML in the template inside of a container div. After that the container had no height because the child elements were floating, which causes any sibling element to be relative to it at the same position. So I also had to add a clearfix hack to that container:

.mm-exhibition-container:after {
  content: " ";
  display: block;
  clear: both;
}

Sorry. Let’s say my namespace is “myplugin” and my website is “example.com”. This would be an example request:

http://example.com/wp-json/myplugin/v1/getstuff/first-slug/second-slug

In my callback function I expect to be able to access (again referencing the example code from the first post) both arguments like this:

function myFunctionToGetStuff($data) {
    $firstSlug = $data['slug']; // in the above request would be "first-slug"
    $secondSlug = $data['secondparam']; //in the above request would be "second-slug"
}