---
title: "Signs a user up for Roblox and links the account to the authenticated external provider ID"
method: POST
path: "/v1/external/signup"
tags: ["Accounts"]
---

# Signs a user up for Roblox and links the account to the authenticated external provider ID

`POST /v1/external/signup`

## Request body

- RobloxAuthenticationApiModelsRequestExternalSignupRequest
  - `username` string
  - `password` string
  - `birthday` string, date-time
  - `locale` string
  - `authenticationProof` string
  - `IdentityProviderPlatformType` 0 | 1 | 2 | 3 — ['Undefined' = 0, 'Xbox' = 1, 'Playstation' = 2, 'Web' = 3]
  - `additionalInfoPayload` object

## Response `200`

OK

## Other responses

- `403` — 0: Token Validation Failed

## Changes

- **2026-09-03** `d9b4ae8b3380` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/roblox/apis/roblox-api/changes/v1/external/signup/post.md)

---

[API](https://skmtc.dev/roblox/apis/roblox-api.md) · [All operations](https://skmtc.dev/roblox/apis/roblox-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/roblox/roblox-api/revisions/d9b4ae8b3380/schema)