Note: For macros to fully populate with a link, you will need to include _URL in the name of the macro. Without the _URL section, a link in the custom macro field will not encode correctly in the HTML field. These URLS in a macro are not link-tracked. For example:
[[SUBSCRIBER_EXAMPLE_LINK_URL]]
https://[[UNIQUE_SUBSCRIBER_LINK_URL]]
Note: The second option will allow for link tracking.