Route::get('/', function() {
    $client = app('amap.client');

    dump($client->api('coordinate')->convert([
        'locations' => '116.481499,39.990475|116.481499,39.990375',
    ]));
    // or
     dump($client->coordinate()->convert([
        'locations' => '116.481499,39.990475|116.481499,39.990375',
     ]));
});