---
title: "The Art of Consent Management in the OAuth World"
description: "How to implement proper consent management to allow users to consciously authorize your applications."
authors:
  - name: "Andrea Chiarelli"
    url: "https://auth0.com/blog/authors/andrea-chiarelli/"
date: "Jul 16, 2026"
category: "Developers,Deep Dive"
tags: ["oauth", "consent", "scope", "rar", "par"]
url: "https://auth0.com/blog/the-art-of-user-consent-management-oauth/"
---

# The Art of Consent Management in the OAuth World

You know those dialogs that appear when you first log in to an app, asking you to authorize it to do certain things? That moment, which most users click through in three seconds without reading, is one of the most important trust transactions in modern software.

For users, it's where they decide whether to hand over access to their data. For developers, it's a responsibility. A vague or incomplete consent screen doesn't just create a bad user experience, it puts users in a position where they can't make an informed decision. And **uninformed consent isn't really consent**.

OAuth 2.0 has evolved considerably in how it handles this. It starts with scopes, the foundation of what users are agreeing to, and evolves through tooling that customizes how those scopes are presented. You can further refine this by layering in two RFC-standardized extensions: [Rich Authorization Requests](https://datatracker.ietf.org/doc/html/rfc9396) and [Pushed Authorization Requests](https://datatracker.ietf.org/doc/html/rfc9126). Together, these extensions handle the cases where basic scopes fall short, ultimately changing how you think about the consent screen.

## What OAuth Scopes Actually Tell Users

OAuth 2.0 uses [**scopes**](https://auth0.com/docs/get-started/apis/scopes) to represent the permissions an application is requesting from a user. When you sign in to a third-party app with your Google account, for example, the consent screen that appears reflects the scopes that app requested: things like `email`, `profile`, or `calendar.readonly`.

Read about [the difference between permissions, privileges, and scopes](https://auth0.com/blog/permissions-privileges-and-scopes/).

The good news is that scopes work well for common cases. They give users a readable summary of what an app wants, and the [OAuth 2.0 Authorization Framework](https://auth0.com/docs/authenticate/protocols/oauth) gives authorization servers the structure to validate, grant, and track those permissions consistently.

The bad news is that scopes are inherently coarse. A scope like `email` tells a user "this app wants your email address," but it doesn't say whether the app wants to read your inbox, send messages on your behalf, or just confirm your email for account creation. From a security standpoint, [OAuth](https://datatracker.ietf.org/doc/html/rfc6819#section-5.1.3) identifies overly broad scopes as a concrete risk, not just a user experience problem. When scopes don't describe what they actually permit, users grant access without understanding what they're agreeing to.

[OpenID Connect](https://auth0.com/docs/authenticate/protocols/openid-connect-protocol) addresses part of this by standardizing scope claims for identity data. The [OIDC spec](https://openid.net/specs/openid-connect-core-1_0.html#ScopeClaims) maps `profile`, `email`, `address`, and `phone` to specific attributes, so at least those scopes carry a predictable meaning. The [FAPI profile](https://openid.net/specs/fapi-security-profile-2_0-final.html) for regulated sectors goes further, recommending that authorization servers clearly [identify the details of the grant to the user during authorization](https://openid.net/specs/openid-financial-api-part-1-1_0.html#authorization-server), a standard that general-purpose OAuth doesn't mandate.

Consent persistence matters too. A grant typically lasts until the user explicitly revokes it. This is practical: nobody wants to re-authorize on every login. However, it means the consent screen you show at onboarding carries weight. Users who approve something vague at signup may not realize what they've enabled until months later.

Two practices improve this significantly:

* **Request granular scopes.** `read:contacts` is better than `contacts` because it communicates direction. `calendar:events:read` is better than `calendar` because it signals what part of the calendar is involved.  
* **Request in context.** Ask for calendar access when the user is about to use the calendar feature, not during initial signup. Users are more likely to understand and accept a permission when they can see why it's needed.

For a deeper look at how scopes interact with roles and client grants in Auth0, see [A Guide to Auth0 Authorization with Scopes, Roles, and Client Grants Explained](https://auth0.com/blog/auth0-authorization-guide-scopes-roles-client-grants/).

## Customizing Consent Screens in Auth0

Auth0 gives you control over how scope text is presented to users during the consent step.

By default, Auth0 groups scopes by resource and condenses them into a single-line summary per group. If your API exposes `read:messages` and `write:message` and a user authorizes both, they'll see something like: *"Messages: read and write your messages."*, as shown in the following screenshot:

![Consent screen based on scopes names](https://images.ctfassets.net/23aumh6u8s0i/1B81JDRDGKhS1KY3H2JkOu/7dfb1ae2c090f0ed7c6b20dbcc4769f0/consent-screen-for-oauth2-scopes.png)

For many applications, that's sufficient. But when your scopes carry meaningfully different implications, or when you're building for regulated contexts, a single combined line doesn't give users enough to work with.

Auth0 lets you switch to description-based prompts, where each scope displays its own individual description. To enable this across your tenant, use the [Auth0 CLI](https://auth0.github.io/auth0-cli/auth0_tenant-settings_update_set.html) or send a PATCH request like the following to the [Management API](https://auth0.com/docs/api/management/v2/tenants/patch-settings):

```http
PATCH /api/v2/tenants/settings
{
  "use_scope_descriptions_for_consent": true
}
```

With this on, users see separate items for each scope. For example, they can see *"Be able to read your email messages"* and *"Write messages on your behalf"* rather than a collapsed summary, as shown below:

![Consent screen based on scope descriptions](https://images.ctfassets.net/23aumh6u8s0i/71lzBi9jN3aUx64B2ToDal/0a3469f41cdb4e2be5b004eda79549b3/consent-screen-with-descriptions.png)

The difference matters: two separate lines with distinct and full descriptions give users a clearer picture of what they're granting.

For more specialized flows, such as parental consent requirements that vary by jurisdiction, Auth0 also supports building [fully custom consent forms](https://auth0.com/docs/customize/forms). The built-in flag-based customization handles most cases; custom forms let you adapt to legal requirements that vary by country.

See the [Auth0 consent prompt customization docs](https://auth0.com/docs/customize/login-pages/customize-consent-prompts) for the full configuration reference.

## Fine-Grained Consent with Rich Authorization Requests

Imagine you're building a payment initiation app. You need a user to authorize a specific transfer: 123.50 USD to Merchant A, from their current account. A scope string like `payment:initiate` tells the user they're authorizing some kind of payment, but not which payment, for how much, or to whom. For a user sitting at a consent screen, that vagueness is exactly the problem: they can't make an informed decision about something that hasn't been specified.

This isn't just a UX concern. In regulated financial services, the authorization server must show transaction-level details before the user can consent. Generic scopes don't carry that information.

The [Rich Authorization Requests (RAR) extension](https://datatracker.ietf.org/doc/html/rfc9396), solves this by adding an `authorization_details` parameter to the authorization request. Instead of (or alongside) scope strings, you pass a JSON array of structured authorization objects. Each object includes a `type` field that identifies the kind of authorization being requested, plus whatever domain-specific fields your application needs.

A payment initiation request using RAR looks like this:

```json
{
  "authorization_details": [
    {
      "type": "payment_initiation",
      "actions": ["initiate"],
      "locations": ["https://example.com/payments"],
      "instructedAmount": {
        "currency": "USD",
        "amount": "123.50"
      },
      "creditorName": "Merchant A",
      "creditorAccount": {
        "accountId": "DE02100100109307118603"
      }
    }
  ]
}
```

Let's briefly break down the key parts of this structure:

* `type` identifies what kind of authorization object this is; the authorization server uses this to validate the structure and route the consent logic.  
* `actions` specifies what the application wants to do (initiate a payment, in this case).  
* `locations` scopes the permission to a specific resource server, preventing token misuse at other endpoints.  
* The domain-specific fields (`instructedAmount`, `creditorName`, `creditorAccount`) carry exactly the information a consent screen needs to show the user what they're approving.

With this payload, the authorization server can display: *"This app wants to initiate a payment of 123.50 USD to Merchant A (Account ID: DE02100100109307118603)."* The user knows exactly what they're authorizing.

`authorization_details` also travels through the token lifecycle. The access token includes the authorized details, reflecting what was actually granted. If the user approved only part of the request, the token reflects that partial grant. The authorization server can also enrich the returned object, for example, confirming the specific account ID the user selected during the consent step.

Auth0 supports RAR for its APIs. You register your custom `type` identifiers on the resource server, configure access policies (whether any application can request a type, or only applications with explicit grants), and set up a customized consent prompt using template variables. For example, to display the transfer amount in the consent screen, you can use a string like the following:

```javascript
Authorize a payment of {{ transaction.params.authorization_details[0].instructedAmount.amount }}
{{ transaction.params.authorization_details[0].instructedAmount.currency }}
to {{ transaction.params.authorization_details[0].creditorName }}?
```

This lets you build a consent screen that shows the specific transaction the user is being asked to approve, rather than a generic "this app wants payment access" message.

See the [Auth0 RAR configuration guide](https://auth0.com/docs/get-started/apis/configure-rich-authorization-requests) for setup steps and type registration.

## Protecting Privacy with Pushed Authorization Requests

RAR solves the expressiveness problem, but introduces a new challenge: you're now putting sensitive, specific data into the authorization request. In standard OAuth, authorization requests travel through the browser as URL query parameters.

Consider what that means in practice. If your authorization request contains a specific account number, a transaction amount, and a beneficiary name, that data now lives in:

* **Browser history**: the URL is stored after the redirect completes.  
* **Server access logs**: at every proxy and load balancer in the request chain.  
* **Referer headers**: if the user navigates to another page after authorization.  
* **Browser extensions** that can read URLs in the address bar.

For applications handling financial data, health records, or other sensitive information, this exposure is a real problem. You've done the work to get informed consent, but the request itself is leaking the sensitive details before the user even sees the consent screen.

[Pushed Authorization Requests](https://datatracker.ietf.org/doc/html/rfc9126) (PAR) solve this by separating the authorization payload from the browser redirect.

Instead of sending all parameters in the browser URL, your application first POSTs the authorization request directly to the authorization server, server-to-server, entirely off the front channel:

```http
POST /oauth/par
Content-Type: application/x-www-form-urlencoded

client_id=app123
&client_secret=s3cr3t
&scope=openid
&authorization_details=[{"type":"payment_initiation",...}]
&redirect_uri=https://myapp.com/callback
```

The authorization server responds with a short-lived reference URI:

```json
{
  "request_uri": "urn:ietf:params:oauth:request_uri:abc123xyz",
  "expires_in": 30
}
```

The browser redirect uses only this reference, nothing sensitive in the URL:

```http
GET /authorize?client_id=app123&request_uri=urn:ietf:params:oauth:request_uri:abc123xyz
```

The browser address bar shows a URI, not an account number. Browser history, referrer headers, and access logs capture nothing useful to an attacker. The reference expires in 30 seconds, making it useless even if captured.

See the [Auth0 PAR endpoint reference](https://auth0.com/docs/api/authentication/authorization-code-flow-with-enhanced-privacy-protection/push-authorization-requests) for the full parameter specification.

PAR also provides an authentication benefit for confidential clients. When a server-side application includes its `client_secret` in the PAR POST, the authorization server can verify that the request was built by your application, not by a third party who constructed or intercepted the URL. Standard browser-based OAuth flows have no equivalent of this verification.

For Auth0 users, PAR is available as part of [Highly Regulated Identity](https://auth0.com/docs/secure/highly-regulated-identity) (available on Enterprise plans). You enable it at the tenant level and can optionally require it per application. When PAR is required on an application, the authorization server rejects any requests that don't use the PAR endpoint first: there's no way to accidentally bypass the protection.

The [blog post on Pushed Authorization Requests](https://auth0.com/blog/what-are-oauth-push-authorization-requests-par/) covers the full flow with additional context on how PAR fits into FAPI-compliant deployments.

## Building Consent That Users Can Trust

These aren't three unrelated features. They form a progression that addresses different layers of the same problem.

Scopes handle the common case well: a user wants to connect their calendar to a productivity app, sees a readable list of permissions, and clicks "Allow". Auth0's consent prompt customization makes that description clearer. Switching from grouped scope names to individual scope descriptions takes one API call and makes a real difference in how well users understand what they're authorizing.

RAR picks up where scopes fall short. When you need users to authorize something specific rather than generic, `authorization_details` carries structured, transaction-level information that a meaningful consent screen can actually display. Financial services and healthcare are the obvious use cases, but any application where "the user needs to know exactly what they're approving" applies can benefit.

PAR protects the data that RAR makes so specific. Once your authorization request contains account identifiers, transaction amounts, or other sensitive details, keeping that payload out of the browser URL is no longer optional. PAR moves the sensitive payload to a back-channel request and gives the browser only a short-lived reference.

The same trust question is emerging for AI agents acting on behalf of users: an agent making a payment or calling an API needs consent for specific actions, not just broad scopes, which makes RAR directly relevant to the next generation of delegated access patterns.

The [OAuth 2.0 Authorization Framework](https://auth0.com/docs/authenticate/protocols/oauth) gives you the foundation; scopes, RAR, and PAR are how you build on it. Getting consent right is a layered problem. The spec provides the primitives; using them well is what builds the trust that users extend to your application every time they click "Allow".