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).
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.
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.
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.
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.
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.
Last updated