Trying to make an API request to deepL

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I’m an absolute noob in webdev and wanted to build a simple website for fun (learning by doing). The idea is to upload pdf documents in one language and get them translated into another. For this I wanna use the deepL API.
Now, I can’t really get it to work. When I press on “submit” in my html form, i get redirected to a blank page and nothing happens. The script which is supposed to connect to the API just doesn’t seem to get reached or something.
My logic was: using the action attribute with a .php-file which handles the form submission and feeds the pdf-document as a parameter to a php function (which is located in functions.php).

Does anyone have an idea where the issue might be or maybe someone could recommend a whole other way how to execute such API requests?

Here are my code snippets:

**HTML form to upload documents:**

<form action=”translate.php” method=”post” enctype=”multipart/form-data”>
<input type=”hidden” name=”action” value=”translate_document”>
<input type=”file” name=”document_file”>
<select name=”target_lang”>
<option value=”DE”>German</option>
</select>
<input type=”submit” value=”Translate”>
</form>

**Handling the submission ( file “translate.php” located in the public folder):**

<?php
function handle_document_translation() {
if (isset($_FILES[‘document_file’][‘tmp_name’])) {
$file_path = $_FILES[‘document_file’][‘tmp_name’];
$target_lang = $_POST[‘target_lang’];
$auth_key = ‘HERE IS MY KEY;

$translation_result = translate_document($file_path, $target_lang, $auth_key);

if ($translation_result !== false) {
// Translation successful, output the result
echo “Translation Result: ” . $translation_result;
} else {
// Translation failed, output an error message
echo “Translation Failed”;
}
}
}
?>

**The actual script to connect to the API (located in functions.php):**

function translate_document($file_path, $target_lang, $auth_key) {
$api_url = ‘https://api-free.deepl.com/v2/document’;

$request_body = array(
‘target_lang’ => $target_lang,
‘file’ => ‘@’ . $file_path
);

$args = array(
‘body’ => $request_body,
‘headers’ => array(
‘Authorization’ => ‘DeepL-Auth-Key ‘ . $auth_key
)
);

$response = wp_remote_post($api_url, $args);

if (is_wp_error($response)) {
return false;
} else {
$response_body = wp_remote_retrieve_body($response);
return $response_body;
}
}

&#x200B;

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