> For the complete documentation index, see [llms.txt](https://docs.codebattles.ru/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.codebattles.ru/api/backend/checker-system-api.md).

# Checker system API

Endpoints for checker system

## (Internal method) Handle checker system callback

> Processes the callback from the checker system, updates the answer status, and calculates the score. Used only for checkers. Access disabled if used via gateway

```json
{"openapi":"3.1.0","info":{"title":"Codebattles backend","version":"0.1.0"},"tags":[{"name":"Checker system API","description":"Endpoints for checker system"}],"servers":[{"url":"http://localhost:8080","description":"Generated server url"}],"paths":{"/api/check_system_callback":{"post":{"tags":["Checker system API"],"summary":"(Internal method) Handle checker system callback","description":"Processes the callback from the checker system, updates the answer status, and calculates the score. Used only for checkers. Access disabled if used via gateway","operationId":"checkerCallBack","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/CheckerCallback"}}},"required":true},"responses":{"200":{"description":"OK"},"401":{"description":"Unauthorized","content":{"*/*":{"schema":{"$ref":"#/components/schemas/UnauthorizedResponse"}}}},"403":{"description":"Forbidden","content":{"*/*":{"schema":{"$ref":"#/components/schemas/AccessDeniedResponse"}}}},"409":{"description":"Conflict","content":{"*/*":{"schema":{"$ref":"#/components/schemas/ConflictResponse"}}}},"500":{"description":"Internal Server Error","content":{"*/*":{"schema":{"$ref":"#/components/schemas/InternalServerErrorResponse"}}}}}}}},"components":{"schemas":{"CheckerCallback":{"type":"object","description":"Callback response from the checker","properties":{"results":{"type":"array","description":"List of program results","items":{"$ref":"#/components/schemas/ProgramResult"}},"meta":{"type":"integer","format":"int64","description":"Metadata associated with the callback"}},"required":["meta","results"]},"ProgramResult":{"type":"object","description":"Result of a program execution","properties":{"success":{"type":"boolean","description":"Indicates if the execution was successful"},"out":{"type":"string","description":"Output of the program"},"msg":{"type":"string","description":"Status message of the execution","enum":["OK","RE","CE","TL","WA","NE"]},"time":{"type":"integer","format":"int32","description":"Execution time in milliseconds"}},"required":["msg","out","success","time"]},"UnauthorizedResponse":{"type":"object","description":"Response returned when the user is not authenticated.","properties":{"message":{"type":"string","description":"Detailed message about the error."},"code":{"type":"integer","format":"int32","description":"HTTP status code representing the error."}}},"AccessDeniedResponse":{"type":"object","description":"Response returned when the user does not have permission to access the requested resource.","properties":{"message":{"type":"string","description":"Detailed message about the error."},"code":{"type":"integer","format":"int32","description":"HTTP status code representing the error."}}},"ConflictResponse":{"type":"object","description":"Response returned when the conflict in data.","properties":{"message":{"type":"string","description":"Detailed message about the error."},"code":{"type":"integer","format":"int32","description":"HTTP status code representing the error."}}},"InternalServerErrorResponse":{"type":"object","description":"Response returned when an unexpected error occurs on the server.","properties":{"message":{"type":"string","description":"Detailed message about the error."},"code":{"type":"integer","format":"int32","description":"HTTP status code representing the error."}}}}}}
```