src/Services/HarvestService.php
public function getCustomFields($parameters=array())
    {
        $this->_harvest = $this->_harvestHelper->parse('getCustomFields', $parameters);
        if (!array_key_exists('id', $parameters)) $this->_harvest['url'] = $this->_harvest['url'] . '/';
        $this->sendRequest();
    }
public function getCustomFields($parameters=array())
    {
        $this->_harvest = $this->_harvestHelper->parse('getCustomFields', $parameters);
        if (!array_key_exists('id', $parameters)) $this->_harvest['url'] = $this->_harvest['url'] . '/';
        $this->sendRequest();
    }
It is explicitely required to do custom field here because we require the trailing slash, because
in this case Sinatra didn't give us an option not to.