NFC Contact and Payment
Objective
Establish the minimum requirements for the interface and system behavior during the NFC payment phase, when the card or device is tapped. This step is critical to the user experience and requires clarity, real-time feedback, and perceived security.
Insights
NFC animations must follow platform standards (Android/iOS) for security and compatibility.
The proximity illustration must respect proportionality and semantics between hand, card, and phone.
This screen must be tested in different contexts: embedded POS, mobile NFC devices, digital wallets.
NFC Contact Screen
01 - Amount and payment type
Must be clearly displayed (e.g., “R$ 122.00 – Credit one-time”)
02 - Contactless illustration
Must clearly indicate the proximity gesture between card and device
03 - Active NFC indicator
Animated or pulsating icon signaling readiness to scan
04 - Promotional coupon (optional)
May be shown at the bottom as a loyalty incentive
05 - Accepted payment methods
Display updated icons of supported card networks and wallets
Mandatory:
The screen must block secondary interactions and focus user attention on the NFC action.
Approved Transaction
06 - Success indicator
Green circle with checkmark and the message “Transaction approved”
07 - “Send receipt” button
Must allow sending the receipt via email, WhatsApp, or other configured channels
08 - “Finish purchase” button
Must complete the operation and return to the home screen or an empty cart state
Mandatory:
Feedback for success must appear instantly (<1s after approval).
Declined Transaction
09 - Error indicator
Red circle with an “X” and the message “Transaction declined”
10 - “Cancel” button
Must terminate the payment process and return to the catalog
11 - “Try again” button
Must restart the NFC scanning process while keeping the current transaction data intact
Mandatory:
Messages must be clear and not blame the user (“Card declined”, not “User error”)
Mandatory Messages
On successful payment:
Transaction approved. Thank you!
On failed payment:
Transaction declined. Please check your card or try another payment method.
Expected Behaviors
The NFC screen must remain active for up to 60 seconds or until manually cancelled.
NFC response must occur in real time (max. 2 seconds latency).
Users must have clear control to retry or exit the flow.
After an error, the NFC module must be fully reset before a new attempt.
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