Custom Settings Save action

hubloy_membership_update_settings_section.php

<?php
add_action( 'hubloy_membership_update_settings_section', 'my_custom_settings_form_update', 10, 2 );
function my_custom_settings_form_update( $section, $post_data ) {
	if ( 'custom' !== $section ) {
		return;
	}
	// Handle your logic here.
	
	return rest_ensure_response(
		array(
			'status'  => true,
			'message' => 'Settings saved',
		)
	);
}