How to download file from external api response source using Laravel?

I need to download files from an api response source using Laravel.

A sample api - (http://webservice.test.de/merchants/orders/getOrderInvoice?key=1234567894&format=json&order_no=444555666.

After calling this API I will get a JSON response. JSON response is given below.

{
    "result": {
        "success": "1",
        "invoice": {
            "src": "webservice.test.de/docs/invoice?secure_key=333444555666777888&key= 1234567894",
            "filename": "Invoice_12345-234566.pdf"
        }
    }
}

When I run this src url (['result']['invoice']['src']) on browser, a pdf file (Invoice_12345-234566.pdf) will download. How can I download file from src using Laravel?

Laravel code

public function curl($url) 
{
 $ch = curl_init();
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
 curl_setopt($ch, CURLOPT_URL, $url);
 curl_setopt($ch, CURLOPT_HEADER, 0);
 $result = curl_exec($ch);
 curl_close($ch);
 $jsonDecodedResults = json_decode($result, true);
 return $jsonDecodedResults;
}

$getOrderInvoice = 'http://webservice.test.de/merchants/orders/getOrderInvoice?key=1234567894&format=json&order_no=444555666';

$jsonDecodedResults = $this->curl($getOrderInvoice);

if( $jsonDecodedResults['result']['success'] === '1' ) {

     $fileSource = $jsonDecodedResults['result']['invoice']['src'];
     $fileName = $jsonDecodedResults['result']['invoice']['filename'];
     $headers = ['Content-Type: application/pdf'];
     return response()->download($fileSource, $fileName, $headers);

}

Error exception: "Symfony\Component\HttpFoundation\File\Exception\FileNotFoundException"

Any help would be appreciated.

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