> ## Documentation Index
> Fetch the complete documentation index at: https://docs.watt.ma/llms.txt
> Use this file to discover all available pages before exploring further.

# Start Charging via QR Code on watt.ma

> Scan the station's QR code from the Charge hub to launch a session and track power, energy, and cost in real time in the app.

From the watt.ma app, you start a charging session by scanning the station's QR code from the **Charge** tab. This page describes the full flow and real-time session tracking.

<img src="https://mintcdn.com/wattsc/JQvCVKleZeBN7Iso/images/app-mobile/05-charge-hub.png?fit=max&auto=format&n=JQvCVKleZeBN7Iso&q=85&s=6b8cfc5c9ab762759b3753c55055f14b" alt="Charge screen in the watt.ma app" width="320" data-path="images/app-mobile/05-charge-hub.png" />

## Pre-Authentication

Before launching your first session, you must have:

1. Created an account via the **Sign Up** screens (name and phone number validation).
2. Validated your number with the 6-digit OTP received by SMS (auto-advance input).
3. Set up a payment method in the wallet (see [Payment](/en/app-mobile/paiement)).

<Note>
  In **Mock Mode**, any 6-digit OTP code is accepted. This is useful for testing the flow without depending on an SMS provider.
</Note>

## Launch a Session

<Steps>
  <Step title="Open the Charge hub">
    Tap the **Charge** tab at the bottom of the screen. This is the app's QR hub.
  </Step>

  <Step title="Scan the QR code">
    The app opens the camera via `expo-camera`. Point it at the QR code displayed on the station to trigger the session.
  </Step>

  <Step title="Confirm and plug in">
    Verify the pricing and connector shown on screen, confirm, and plug in your vehicle.
  </Step>
</Steps>

## Session Tracking

Once the session is launched, the app displays in real time:

* The **instantaneous power** (43 kW by default in Mock Mode)
* The **energy delivered** in kWh
* The **elapsed time** since the start
* The **cumulative cost** in dirhams

<Info>
  Connector commands rely on the OCPP protocol. In Mock Mode, values are simulated and updated every second. Once `EXPO_PUBLIC_MOCK_MODE=false`, the app sends real commands to the backend via `OCPP_BACKEND_URL`.
</Info>

## Stop the Session

Tap **Stop** in the app to end the session. The final amount is debited from the prepaid wallet and the transaction appears in the [history](/en/app-mobile/historique).

<Warning>
  Do not unplug the cable before stopping the session in the app. Some vehicles lock the connector while the session is active.
</Warning>