Update existing contact in Mailchimp - mailchimp

Question

Hello guys I am trying to update a contact in my list with CRUL. I think everything looks great, only one think that I don't understand is {subscriber_hash}. How can i get this? Or maybe thats not a problem
I get this response
Exists","status":400,"detail":"example#example.com is already a list member. Use PUT to insert or update list members.","instance":"a5de431b-3b5a-3149-1fe3-bc1f6d08ec24"}
But my code looks good i think
$list_id = '[LISTID]';
$authToken = '[APIKEY]';
$postData = array(
"email_address" => "example#example.com",
"status" => "subscribed"
);
$curl = curl_init();
curl_setopt_array($curl, array(
CURLOPT_URL => 'https://us12.api.mailchimp.com/3.0/lists/'.$list_id.'/members/{subscriber_hash}',
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "PUT",
CURLOPT_POSTFIELDS => json_encode($postData),
CURLOPT_HTTPHEADER => array(
'Authorization: apikey '.$authToken,
"cache-control: no-cache",
"content-type: application/json"
),
));
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}

Answer 1

This is the working code finally
$list_id = 'LISTID';
$authToken = 'APIKEY';
// The data to send to the API
$postData = array(
"email_address" => "example#example.com",
"status" => "subscribed",
"firstname" => "asd",
"lastname" => "asda"
);
$data = $postData;
function syncMailchimp($data) {
$apiKey = 'APIKEY';
$listId = '0LISTID';
$memberId = md5(strtolower($data['email_address']));
$dataCenter = substr($apiKey,strpos($apiKey,'-')+1);
$url = 'https://' . $dataCenter . '.api.mailchimp.com/3.0/lists/' . $listId . '/members/' . $memberId;
$json = json_encode([
'email_address' => $data['email_address'],
'status' => $data['status'], // "subscribed","unsubscribed","cleaned","pending"
'merge_fields' => [
'FNAME' => 'asd',
'LNAME' => 'asd'
]
]);
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_USERPWD, 'user:' . $apiKey);
curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type: application/json']);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_TIMEOUT, 10);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PATCH');
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_POSTFIELDS, $json);
$result = curl_exec($ch);
$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
return $result;
}
$res = syncMailchimp($data);
print_r($res);