# Obtain signature information

Obtain the information to be signed, mainly used for interfaces that require signature verification, such as login, etc.

## Obtain signature information

> Submit Loan Application

```json
{"openapi":"3.0.1","info":{"title":"Default Module","version":"1.0.0"},"servers":[{"url":"http://127.0.0.1:8090","description":"Local"}],"security":[],"paths":{"/api/nexus/manage/signature/challenge":{"post":{"summary":"Obtain signature information","deprecated":false,"description":"Submit Loan Application","tags":[],"parameters":[],"requestBody":{"content":{"application/json":{"schema":{"type":"object","properties":{"message":{"type":"string","title":"Additional signature information, empty by default"},"params":{"type":"object","properties":{},"title":"Keep consistent with the next endpoint parameters"}},"required":["message","params"]}}}},"responses":{"200":{"description":"","content":{"application/json":{"schema":{"type":"object","properties":{"code":{"type":"integer"},"msg":{"type":"string"},"data":{"type":"object","properties":{"message":{"type":"string"}},"required":["message"]},"req_id":{"type":"string"}},"required":["code","msg","data","req_id"]}}},"headers":{}}}}}}}
```