> For the complete documentation index, see [llms.txt](https://docs.emsigner.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.emsigner.com/apis/api-reference/authentication/device-registration.md).

# Device Registration

## POST /api/Public/DeviceRegistration/register

> Register device registration

```json
{"openapi":"3.0.1","info":{"title":"emSigner Core API","version":"v1"},"tags":[{"name":"DeviceRegistration"}],"servers":[{"url":"https://demoapi-core.emsigner.com","description":"Demo / Sandbox"},{"url":"{baseUrl}","description":"Custom environment","variables":{"baseUrl":{"default":"https://demoapi-core.emsigner.com","description":"Base URL of your emSigner environment (e.g. production or on-prem API host)"}}}],"security":[{"Bearer":[]}],"components":{"securitySchemes":{"Bearer":{"type":"http","description":"JWT access token from POST /auth/token. Paste the token without the \"Bearer \" prefix.","scheme":"bearer","bearerFormat":"JWT"}},"schemas":{"emSignerCoreAPI.CoreApi.Public.Controllers.RegisterDeviceRequest":{"type":"object","properties":{"deviceId":{"type":"string","nullable":true},"deviceType":{"type":"integer","format":"int32"},"fcmToken":{"type":"string","nullable":true},"platform":{"type":"integer","format":"int32","nullable":true}},"additionalProperties":false},"emSignerCoreAPI.CoreApi.Public.Controllers.RegisterDeviceResponse":{"type":"object","properties":{"success":{"type":"boolean"},"alreadyRegistered":{"type":"boolean"},"message":{"type":"string","nullable":true}},"additionalProperties":false},"Microsoft.AspNetCore.Mvc.ProblemDetails":{"type":"object","properties":{"type":{"type":"string","nullable":true},"title":{"type":"string","nullable":true},"status":{"type":"integer","format":"int32","nullable":true},"detail":{"type":"string","nullable":true},"instance":{"type":"string","nullable":true}},"additionalProperties":{}}}},"paths":{"/api/Public/DeviceRegistration/register":{"post":{"tags":["DeviceRegistration"],"requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/emSignerCoreAPI.CoreApi.Public.Controllers.RegisterDeviceRequest"}}}},"responses":{"200":{"description":"OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/emSignerCoreAPI.CoreApi.Public.Controllers.RegisterDeviceResponse"}}}},"400":{"description":"Bad Request","content":{"application/json":{"schema":{"$ref":"#/components/schemas/Microsoft.AspNetCore.Mvc.ProblemDetails"}}}},"401":{"description":"Unauthorized","content":{"application/json":{"schema":{"$ref":"#/components/schemas/Microsoft.AspNetCore.Mvc.ProblemDetails"}}}},"500":{"description":"Internal Server Error"}},"summary":"Register device registration","operationId":"post_DeviceRegistration_register"}}}}
```