Downloading & Uploading a file with cURL - php

Question

I have been trying to use cURL to interact with an api, I want to download a file with this snippet but all it does is open up the file in the browser and the second snippet is supposed to upload a pdf file along with multipart form data with cURL, but all it give me is;
"{"type":"request_error","detail":"Multipart form parse error - Invalid boundary in multipart: None"}"
error, I have already tried to execute the thing with postman, it runs fine there and when i copy and paste the same code it still gives me the same errors as above, cheers, thanks in advance.
Here is the code;
Downloading Snippet
$id = "rZFbMKmj2zZbMUbp5KrjCH";
$auth = $this->access_token;
$curl = curl_init( PANDA_APIURL . "/documents/".$id."/download");
//$fp = fopen('Test.pdf', 'w+');
curl_setopt_array($curl, array(
CURLOPT_URL => PANDA_APIURL . "/documents/".$id."/download",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 50,
CURLOPT_TIMEOUT => 300,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
//CURLOPT_FILE => $fp,
CURLOPT_CUSTOMREQUEST => "GET",
CURLOPT_HTTPHEADER => array(
"Authorization: Bearer $auth"
),
));
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
//fclose($fp);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}
Uploading the file with multipart form data snippet;
$auth = $this->access_token;
$boundary = '7aBMjcE3CIYntqQ3';
$curl = curl_init();
curl_setopt_array($curl, array(
CURLOPT_URL => PANDA_APIURL . "/documents",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => '------WebKitFormBoundary7aBMjcE3CIYntqQ3
Content-Disposition: form-data; name="file"; filename="samplepdf.pdf"
Content-Type: application/pdf
------WebKitFormBoundary7aBMjcE3CIYntqQ3
Content-Disposition: form-data; name="data"
{
"name": "Pdf Doc",
"recipients": [
{
"email": "xyz#gmail.com",
"first_name": "Jane",
"last_name": "Roe"
}
],
"fields": {
"name": {
"value": "John"
},
"like": {
"value": true
}
}
}
------WebKitFormBoundary7aBMjcE3CIYntqQ3',
CURLOPT_HTTPHEADER => array(
"Authorization: Bearer $auth",
"Content-Type: multipart/form-data;----WebKitFormBoundary'.$boundary"
),
));
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}