Upload file using Guzzle 6 to API endpoint

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The way you are POSTing data is wrong, hence received data is malformed.

Guzzle docs:

The value of multipart is an array of associative arrays, each
containing the following key value pairs:

name: (string, required) the form field name

contents:(StreamInterface/resource/string, required) The data to use in the
form element.

headers: (array) Optional associative array of custom headers to use with the form element.

filename: (string) Optional
string to send as the filename in the part.

Using keys out of above list and setting unnecessary headers without separating each field into one array will result in making a bad request.

$res = $client->request('POST', $this->base_api . $endpoint, [
    'auth'      => [ env('API_USERNAME'), env('API_PASSWORD') ],
    'multipart' => [
        [
            'name'     => 'FileContents',
            'contents' => file_get_contents($path . $name),
            'filename' => $name
        ],
        [
            'name'     => 'FileInfo',
            'contents' => json_encode($fileinfo)
        ]
    ],
]);

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