public function get($parameter)
    {
        return isset($this->credentials[$parameter]) ? $this->credentials[$parameter] : null;
    }
public function get($parameter)
    {
        return isset($this->credentials[$parameter]) ? $this->credentials[$parameter] : null;
    }
public function get ( $ parameter ) { return isset ( $ this -> credentials [ $ parameter ] ) ? $ this -> credentials [ $ parameter ] : null ; }
Get a single credential parameter.

@param string $parameter
@return mixed|null
Get a single credential parameter .