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General scheme

A sign-in starts in your app: it sends the browser to the sign-in page with a standard OpenID Connect redirect. The user confirms in a channel, and the browser returns to your app with a code that your app exchanges for tokens.
Signing in through Veriqa: your app sends the browser to the sign-in page by an OpenID Connect redirect, the person confirms in a channel, and Veriqa redirects back so your app can exchange the code for tokens.
An action confirmation starts on your server: it creates a transaction through the Veriqa API. The user confirms in a channel, and your server reads the answer and performs the action. The browser is not redirected.
Confirming an action through Veriqa: your server creates the transaction, the person scans the QR code your app shows and confirms in a channel, and your server reads the answer and performs the action.
See Basic scenarios.

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Signing in on a computer

Signing in on a computer with Messenger: the sign-in window shows a QR code, the phone camera scans it, the user taps Confirm in the Messenger chat, and the chat replies "Sign-in confirmed".

The user scans the QR code with their phone camera and confirms in the Messenger chat.

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Signing in on a phone

Signing in on a phone: the user taps "Sign in with Messenger", confirms in the Messenger chat, and the chat replies "Sign-in confirmed".

The user taps "Sign in with Messenger" and confirms in the Messenger chat.

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Step-up: confirming an action

Confirming a purchase: the app shows a QR code for a $99 plan, the phone camera scans it, the user confirms in Messenger, and the chat replies "Purchase confirmed".

The app shows a QR code, and the user scans it with their phone camera and confirms the purchase in Messenger.

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Claims your app can get

Claims your app can get from signing in with Messenger: sub, amr, channel_type, channel_user_id, name, given_name, family_name, locale, picture, phone_number, phone_number_verified false, and email with email_verified after an email confirmation.