Use URL field in custom template

I’m trying to include a field in the testimonial that can link to a custom URL.
I have added a ‘URL’ type field and ticked the box saying “Show this field in the admin list table.”.
In my custom template I can use <?php wpmtst_field( 'my_custom_URL' ); ?> to show the text of the link, however if I try to wrap this in code like <a href="<?php wpmtst_field( 'my_custom_URL' ); ?>">Link Text</a> it doesn’t create the link. The href is just empty.
What am I doing wrong?

• This topic was modified 5 years, 6 months ago by shaunbowen.