cURL: wait for response until it is processed by api - php

Question

everybody,
I am using the following code for synchronizing data with an API ($method= POST) and then I call using the GET method ($method= GET) to print the result of the synchronization:
function sendCurl ($fileName, $method)
{
$curl = curl_init();
curl_setopt_array($curl, array(
CURLOPT_URL => $url,
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 0,
CURLOPT_FOLLOWLOCATION => true,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => $method,
CURLOPT_POSTFIELDS => array('file' => new CURLFILE($fileName)),
CURLOPT_HTTPHEADER => array(
"Authorization: xxxxxxxxxxxxxxx",
"Accept: application/json."
"Content-Type: multipart/form-data"
),
));
$response = curl_exec($curl);
curl_close($curl);
return $response;
}
The problem is that the GET method response arrives before the API has time to process it. Therefore, when I print the response I print WAITING FOR RESPONSE and not whether it went ok or failed.
What can I do to print the ok or fail and not the WAITING FOR RESPONSE?
Thank you very much!