결제 취소 실패

제 API().
curl 'INVALID_REQUEST'.
?

(php)
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.tosspayments.com/v1/payments/paymentKey/cancel",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => "{"cancelReason":{cancelReason}}",
CURLOPT_HTTPHEADER => [
"Authorization: Basic {secretKey}",
"Content-Type: application/json"
],
]);
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