I figured it out. Simply, in my request, under data, I added
"nonce" : "<?php echo wp_create_nonce( 'refresh_my_plugin' ); ?>"
then to verify
if (isset($_POST['refresh_my_plugin']))
if ( wp_verify_nonce( $_POST['nonce'], 'refresh_my_plugin' ) )
refresh_my_plugin();
With incorrect wp_verify_nonce, I instead get a 403, which is reflected on the button with the error handler.
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