Cid can't be null. 오류 문의 드립니다

카카오페이 테스트를 하는데요. 아래와 같이 오류가 발생하고 있습니다.
마지막에 cid값이 있는것을 확인할 수 있는데요. cid값이 왜 없다고 나오는지요?

2021-05-24 15:10:50.650 e[39mDEBUGe[0;39m [http-nio-28080-exec-19:wire.wire] org.apache.http.wire.wire(72) - http-outgoing-0 >> "POST /v1/payment/ready HTTP/1.1[\r][\n]"
2021-05-24 15:10:50.651 e[39mDEBUGe[0;39m [http-nio-28080-exec-19:wire.wire] org.apache.http.wire.wire(72) - http-outgoing-0 >> "Accept: text/plain, text/plain, application/json, application/*+json, /, /[\r][\n]"
2021-05-24 15:10:50.651 e[39mDEBUGe[0;39m [http-nio-28080-exec-19:wire.wire] org.apache.http.wire.wire(72) - http-outgoing-0 >> "Content-Type: application/x-www-form-urlencoded;charset=utf-8[\r][\n]"
2021-05-24 15:10:50.651 e[39mDEBUGe[0;39m [http-nio-28080-exec-19:wire.wire] org.apache.http.wire.wire(72) - http-outgoing-0 >> "Authorization: KakaoAK xxxxxxxxxxxxxx[\r][\n]"
2021-05-24 15:10:50.652 e[39mDEBUGe[0;39m [http-nio-28080-exec-19:wire.wire] org.apache.http.wire.wire(72) - http-outgoing-0 >> "Accept-Charset: big5, big5-hkscs, cesu-8, euc-jp, euc-kr, gb18030, gb2312, gbk, ibm-thai, ibm00858, ibm01140, ibm01141, ibm01142, ibm01143, ibm01144, ibm01145, ibm01146, ibm01147, ibm01148, ibm01149, ibm037, ibm1026, ibm1047, ibm273, ibm277, ibm278, ibm280, ibm284, ibm285, ibm290, ibm297, ibm420, ibm424, ibm437, ibm500, ibm775, ibm850, ibm852, ibm855, ibm857, ibm860, ibm861, ibm862, ibm863, ibm864, ibm865, ibm866, ibm868, ibm869, ibm870, ibm871, ibm918, iso-2022-cn, iso-2022-jp, iso-2022-jp-2, iso-2022-kr, iso-8859-1, iso-8859-13, iso-8859-15, iso-8859-2, iso-8859-3, iso-8859-4, iso-8859-5, iso-8859-6, iso-8859-7, iso-8859-8, iso-8859-9, jis_x0201, jis_x0212-1990, koi8-r, koi8-u, shift_jis, tis-620, us-ascii, utf-16, utf-16be, utf-16le, utf-32, utf-32be, utf-32le, utf-8, windows-1250, windows-1251, windows-1252, windows-1253, windows-1254, windows-1255, windows-1256, windows-1257, windows-1258, windows-31j, x-big5-hkscs-2001, x-big5-solaris, x-euc-jp-linux, x-euc-tw, x-eucjp-open, x-ibm1006, x-ibm1025, x-ibm1046, x-ibm1097, x-ibm1098, x-ibm1112, x-ibm1122, x-ibm1123, x-ibm1124, x-ibm1166, x-ibm1364, x-ibm1381, x-ibm1383, x-ibm300, x-ibm33722, x-ibm737, x-ibm833, x-ibm834, x-ibm856, x-ibm874, x-ibm875, x-ibm921, x-ibm922, x-ibm930, x-ibm933, x-ibm935, x-ibm937, x-ibm939, x-ibm942, x-ibm942c, x-ibm943, x-ibm943c, x-ibm948, x-ibm949, x-ibm949c, x-ibm950, x-ibm964, x-ibm970, x-iscii91, x-iso-2022-cn-cns, x-iso-2022-cn-gb, x-iso-8859-11, x-jis0208, x-jisautodetect, x-johab, x-macarabic, x-maccentraleurope, x-maccroatian, x-maccyrillic, x-macdingbat, x-macgreek, x-machebrew, x-maciceland, x-macroman, x-macromania, x-macsymbol, x-macthai, x-macturkish, x-macukraine, x-ms932_0213, x-ms950-hkscs, x-ms950-hkscs-xp, x-mswin-936, x-pck, x-sjis_0213, x-utf-16le-bom, x-utf-32be-bom, x-utf-32le-bom, x-windows-50220, x-windows-50221, x-windows-874, x-windows-949, x-windows-950, x-windows-iso2022jp[\r][\n]"
2021-05-24 15:10:50.652 e[39mDEBUGe[0;39m [http-nio-28080-exec-19:wire.wire] org.apache.http.wire.wire(72) - http-outgoing-0 >> "Content-Length: 290[\r][\n]"
2021-05-24 15:10:50.653 e[39mDEBUGe[0;39m [http-nio-28080-exec-19:wire.wire] org.apache.http.wire.wire(72) - http-outgoing-0 >> "Host: kapi.kakao.com[\r][\n]"
2021-05-24 15:10:50.653 e[39mDEBUGe[0;39m [http-nio-28080-exec-19:wire.wire] org.apache.http.wire.wire(72) - http-outgoing-0 >> "Connection: Keep-Alive[\r][\n]"
2021-05-24 15:10:50.653 e[39mDEBUGe[0;39m [http-nio-28080-exec-19:wire.wire] org.apache.http.wire.wire(72) - http-outgoing-0 >> "User-Agent: Apache-HttpClient/4.5.2 (Java/1.8.0_181)[\r][\n]"
2021-05-24 15:10:50.653 e[39mDEBUGe[0;39m [http-nio-28080-exec-19:wire.wire] org.apache.http.wire.wire(72) - http-outgoing-0 >> "Accept-Encoding: gzip,deflate[\r][\n]"
2021-05-24 15:10:50.653 e[39mDEBUGe[0;39m [http-nio-28080-exec-19:wire.wire] org.apache.http.wire.wire(72) - http-outgoing-0 >> "[\r][\n]"
2021-05-24 15:10:50.653 e[39mDEBUGe[0;39m [http-nio-28080-exec-19:wire.wire] org.apache.http.wire.wire(86) - http-outgoing-0 >> "{partner_order_id=1001, quantity=1, total_amount=2100, tax_free_amount=100, partner_user_id=gorany, item_name=[0xea][0xb0][0xa4][0xeb][0x9f][0xad][0xec][0x8b][0x9c]S9, approval_url=http://localhost:28080/kakaoPay/success, cancel_url=http://localhost:28080/kakaoPay/cancel, fail_url=http://localhost:28080/kakaoPay/fail, cid=TC0ONETIME}"
2021-05-24 15:10:50.670 e[39mDEBUGe[0;39m [http-nio-28080-exec-19:wire.wire] org.apache.http.wire.wire(72) - http-outgoing-0 << "HTTP/1.1 400 Bad Request[\r][\n]"
2021-05-24 15:10:50.670 e[39mDEBUGe[0;39m [http-nio-28080-exec-19:wire.wire] org.apache.http.wire.wire(72) - http-outgoing-0 << "Date: Mon, 24 May 2021 06:10:51 GMT[\r][\n]"
2021-05-24 15:10:50.671 e[39mDEBUGe[0;39m [http-nio-28080-exec-19:wire.wire] org.apache.http.wire.wire(72) - http-outgoing-0 << "Server: Apache[\r][\n]"
2021-05-24 15:10:50.671 e[39mDEBUGe[0;39m [http-nio-28080-exec-19:wire.wire] org.apache.http.wire.wire(72) - http-outgoing-0 << "Caller-AppId: 313698[\r][\n]"
2021-05-24 15:10:50.671 e[39mDEBUGe[0;39m [http-nio-28080-exec-19:wire.wire] org.apache.http.wire.wire(72) - http-outgoing-0 << "Content-Type: application/json;charset=UTF-8[\r][\n]"
2021-05-24 15:10:50.671 e[39mDEBUGe[0;39m [http-nio-28080-exec-19:wire.wire] org.apache.http.wire.wire(72) - http-outgoing-0 << "Content-Length: 38[\r][\n]"
2021-05-24 15:10:50.671 e[39mDEBUGe[0;39m [http-nio-28080-exec-19:wire.wire] org.apache.http.wire.wire(72) - http-outgoing-0 << "Connection: close[\r][\n]"
2021-05-24 15:10:50.671 e[39mDEBUGe[0;39m [http-nio-28080-exec-19:wire.wire] org.apache.http.wire.wire(72) - http-outgoing-0 << "[\r][\n]"
2021-05-24 15:10:50.671 e[39mDEBUGe[0;39m [http-nio-28080-exec-19:wire.wire] org.apache.http.wire.wire(86) - http-outgoing-0 << “{“msg”:“cid can’t be null.”,“code”:-2}”