Retrieve Subscription API Call Returning INVALID_REQUEST_ERROR

Hi there, I’m using PHP and the curl_init function to try to run the Retrieve Subscription API call. Here is my code:

$curl_url = "" . $subscriptionID;

system_log("curl_url is $curl_url");

if (($subscriptionID != "") && ($curl_url != "")) {
    $ch = curl_init($curl_url);
    curl_setopt_array($ch, array(
        CURLOPT_HTTPHEADER => array(
            'Square-Version: 2023-09-25',
            'Authorization: Bearer ' . $GLOBALS['square_access_token'],
            'Content-Type: application/json'

    $response = curl_exec($ch);
    system_log("response is $response");

system_log is just a simple function I have to log information to the database. The $response I’m constantly getting is:

“errors”: [{
“code”: “NOT_FOUND”,
“detail”: “Resource not found.”

I have verified that the $subscriptionID variable is being passed in correctly, and the $curl_url value is correctly being set. I’ve also verified that the $subscriptionID is valid using the API Explorer, where I get valid data returned.

I’m using the API to make far more complicated calls, using the exact same code format, so I’m at a complete loss as to why (what should be) the simplest call that I have to make is failing…

Thank you in advance for your help!

Well, I figured it out…

CURLOPT_POST needs to be set to FALSE when making this API call… All of the others work just fine as POST calls…but apparently this one has to be a GET call…