Point of Sale (POS) mode

[n13]

Add POS mode in Settings

Version 1 - MVP

• Turn on POS mode in Settings
• Get "New Charge" button on main screen
• Enter amount
• Get payment QR code
• Scan with other device -> Send screen with the amount

TBD:

• Scan for tx on the Cash register phone - maybe just increase scan frequency as long as there's outstanding, for up to 1 minute.
• Use the reference number to peek transaction hash
• NFC mode

POS Payment URL: https://www.quantus.com/pay?to=qzkuQhrEckiP2DQG4We6vwKptMQdm3AAtnH5tJaZeYxHQ1ofr&amount=2.8&ref=MMUDDWB2

[n13]

IMG_1321.MP4

2026-03-18.12.06.58.mp4

[dewabisma]

Please use the standard button component, if need new variant please add there :)

[dewabisma]

Can't we use the number formatting that we use in the usual send input?

[dewabisma]

Not really sure this is the best way to do this, because some locales use comma instead of dot to as decimal notation.

[dewabisma]

Please use the standard button component, add new variant if needed

[dewabisma]

I think we should keep button in control, and other concern about the keypad logic

[n13]

I've addressed all the PR review comments by making the following changes:

1. Standardized Buttons:

   • Added an accent variant to the standard Button component in lib/features/components/button.dart to support the green accent color used in the POS screens.
   • Replaced the custom Container buttons in both home_screen.dart ("New Charge" button) and pos_amount_screen.dart ("Charge" button) with the standard Button component using the new ButtonVariant.accent.

2. Number Formatting Logic:

   • Updated _onDigit in pos_amount_screen.dart to use the standard DecimalInputFilter from quantus_sdk (which is exactly what the usual send input uses). This ensures that the input formatting logic is consistent across the app and handles edge cases properly.

3. Locale-Aware Decimal Separator:

   • Replaced the hardcoded . in the custom keypad of pos_amount_screen.dart with NumberFormat().symbols.DECIMAL_SEP from the intl package. This ensures that users in locales that use commas for decimals (e.g., ,) will see and use the correct separator on the keypad.

[dewabisma]

Wonderful!