Noob question about Site Set Attributes (5.8)

Hi all, I'm fairly new to the C5 arena so please go easy on me if this seems stupid.

I'm wanting to set a global attribute for a site (a url for an external booking link). I'd like the client to be able to edit this value if they see fit and it propagate throughout the theme so I thought I'd at a new Set with a custom attribute within the Site category (presuming thats the category for sitewide attributes?). Trying it this way rather than hardcoding it into the theme pages.

Question is how do I retrieve the values inside the Site Set within my theme? My custom attribute has a handle of 'booking_url' inside a set 'booking_details'.

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jakobfuchs replied on at Permalink Reply
PineCreativeLabs replied on at Permalink Reply
You could simply use a sitewide (global) area and use either the content or html block within it. If your theme doesn't have a global area where you want it to be editable, you'll need to add one.
<?php $a = new GlobalArea('Booking Link'); $a->display($c); ?>

And just drop a content (or HTML) block in there with the link.
drcodswallop replied on at Permalink Best Answer Reply
Thanks for the suggestions. Found a solution in the 8.0 release notes which says:

Custom attributes can now be globally applied to your site, and easily accessed by calling

I created my custom attribute in System & Settings > Basics, targeted the handle with the above code and all is well :)
okapi replied on at Permalink Reply
Thanks for sharing!
I'm using that in a page template:

<?php echo Site::getSite()->getAttribute('attribute_handle'); ?>

Works in C5 version 8.5.2