curl --location --request POST 'https://api.qugongbao.com/gst-api/api/qgb/contract/memberBackendSign' \
--header 'Content-Type: application/json' \
--data-raw '{
"custNo": "string",
"memberNo": "string",
"idCardNo": "string",
"spCode": "string",
"serverCallbackUrl": "string"
}'{
"contractNo": "string"
}