How to Automate Email Verification in Playwright Using Microsoft Graph API

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End-to-end test automation for flows like user registration and OTP verification is often blocked when emails are involved, as UI-based webmail automation is unreliable due to CAPTCHAs and two-factor authentication. A practical alternative is to use the Microsoft Graph API with Azure App Registration and the Client Credentials Flow, which allows Playwright tests to fetch inbox messages programmatically without any browser interaction. The setup requires registering an Azure Entra ID app, granting Mail.Read permissions with admin consent, and securely storing the client credentials as environment variables. Developers can then build a reusable TypeScript helper service that handles authentication, inbox polling, and pattern extraction for links or OTP codes. This service integrates directly into Playwright test files, enabling reliable and stable automated verification of email-dependent user flows.

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