결제 취소 시 응답 값 문제 Bad Request

때 Bad Request , ?

curl --request POST \
--url https://api.tosspayments.com/v1/payments/주문ID/cancel \
--header 'Authorization: Basic 릿키 base64' \
--header 'Content-Type: application/json' \
--data '{"cancelReason":"","cancelAmount":1000}'
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