Introduction to Revolut ID SDK for iOS

Welcome to the Revolut ID SDK for iOS, a lightweight tool that lets your iOS application authenticate users with their Revolut account. Our goal is to give merchants a simple, secure way to request user permissions and receive the credentials needed to perform token exchange on the backend.

This SDK allows you to leverage the following features and benefits:

1. Revolut authentication via OAuth 2.0 with PKCE: The SDK handles the full authorisation flow — launching the Revolut app or web experience and returning a code and codeVerifier your backend uses to obtain tokens.
2. Minimal integration surface: A single authorise(scope:completion:) method covers the entire user-facing flow, keeping your integration lean and easy to maintain.
3. Secure credential exchange: The PKCE code-verifier pattern prevents authorisation code interception, ensuring the token exchange between your backend and Revolut's token endpoint is protected.
4. Sandbox environment for testing: Swap to .sandbox during development to iterate against Revolut's sandbox without affecting production data or requiring a live client ID.
5. Configurable logging: Choose from .none, .warning, or .error log levels to get the right level of SDK diagnostics during development and production.

By integrating the Revolut ID SDK into your iOS app, you give your customers a frictionless way to share their Revolut identity with your service — backed by Revolut's secure authentication infrastructure.