Our development site stopped receiving a response back from our authorize.net sandbox. The Curl code has been functioning correctly for sometime and we have no evidence of anything changing in our repo. I tested the API request on the API documentation Authorize.net page and it worked correctly. Our production site seems to be functioning appropriately.
Here is an example of our PHP Curl
// CURL to endpoint
$ch = curl_init();
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $obj);
curl_setopt($ch, CURLOPT_URL, 'https://apitest.authorize.net/xml/v1/request.api');
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$response = curl_exec($ch);
$status_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
$curl_errors = curl_error($ch);
curl_close($ch);
response returns blank, status_code returns 0, curl_errors returns blank.
