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Add scope parameter to Login API and Passwordless Login API #3558

Description

@MaxielMrvaljevic

Problem

/api/login and /api/passwordless/login do not accept a scope parameter, so the resulting access and refresh tokens are always issued with no scope, and a token issued by either endpoint has no path to becoming scoped without an additional exchange.

Solution

Add an optional scope parameter to /api/login and /api/passwordless/login, so the access and refresh tokens returned by either endpoint can be issued with the requested scope directly, without a separate authorization step.

Alternatives/workarounds

The current workaround is to use the scopeless access token from either login endpoint as a Bearer credential against /oauth2/authorize?scope=X, then exchange the resulting authorization code at /oauth2/token. This is functional, but requires implementing redirect interception (reading the authorization code from the Location header without following the redirect) for a fully API-driven client with no browser involved.

Additional context

This affects integrations that call /api/login or /api/passwordless/login directly instead of redirecting to FusionAuth's hosted login pages. Hosted login pages already support requesting a scope on the initial /oauth2/authorize call; direct API integrations have no equivalent option.

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All issues filed in this repository must abide by the FusionAuth community guidelines.

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