App Initialization

Objective

This section defines the minimum requirements for the application startup flow, ensuring that the device environment is suitable and secure to process proximity-based payments (Tap to Pay).

Insights

• Using friendly illustrations is recommended to reduce friction during verification.

• The “Continue” button must be visually and functionally linked to a successful security validation.

• This step is mandatory to ensure compliance with proximity payment security best practices (e.g., PCI MPoC).

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Welcome Screen

01 - Illustrative icon

Must represent the store context. Custom branding is allowed, as long as it maintains legibility and proper contrast.

02 - Welcome message

Must include the store name and a short message guiding the user through the app.

03 - “Enter” button

Must be clearly highlighted as the main action. Triggers the mandatory security check before granting access to the app.

Mandatory:

A clear and visible button must be available to start the environment verification before enabling the payment functionality.

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Security Checklist

04 - Magnifying glass illustration

Optional visual element. Recommended to indicate inspection or safety check.

05 - Verification checklist

Must include all items that are checked during the security scan.

Mandatory:

Each item must visibly show either valid or invalid, so the user can clearly understand which requirements are met.

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Environment Ready

06 - All items marked as checked

All conditions must be positively validated.

07 - “Continue” button (enabled)

Must be displayed as the main action and only enabled when all conditions are fulfilled.

Mandatory:

The “Continue” button should only become available when all items in the checklist are validated. The action must lead to the sales interface.

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Environment with Restrictions

08 - Invalid item highlighted in red

Example: NFC deactivated. The item must be visually emphasized with a red icon and clear explanatory label.

09 - “Continue” button (disabled)

The button must be clearly inactive (greyed out) and non-clickable while any item in the checklist is not satisfied.

Mandatory:

The "Continue" button must remain disabled until all checklist requirements are met.

Recommended:

Display contextual guidance for the user, such as “Activate NFC to continue.”

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Expected Behaviors

• The checklist must run automatically after pressing “Enter”.

• Immediate visual feedback must be provided (green or red icon) for each checklist item.

• If any requirement fails, the interface must clearly inform the user in non-technical language.

• The “Continue” button must only be available once all validations return.

Mandatory Messages

• When NFC is deactivated:

  NFC is deactivated. Please activate NFC to continue using Tap to Pay.

• When the app is running in a suspicious environment:

  Unsecure environment detected. Please check your device's integrity.