UPI Hub v0.4.0

UPI Hub 0.4.0

Install techswitch-upihub-0.4.0.apk on Android 7.0 or newer (allow "Install
unknown apps" for your browser or file manager). It installs over earlier
0.x builds signed with the same key.

What's in this version

• Opens straight into a QR scanner; pay from a screenshot or a typed UPI ID.
• Lists every installed UPI app, including apps such as super.money whose
  link handler omits the default category.
• No built-in default: pick yours from all installed UPI apps on first launch.
• Payment apps screen: reorder, show or hide apps, sort A–Z.
• Asks for the amount when a QR code has none (needed by apps like Kiwi).
• Home-screen Scan & Pay widget; light and dark themes.

Verified with unit and Robolectric tests; not yet tested by the authors on
every UPI app. SHA256SUMS lists the file checksums.

iPhone (unsigned preview)

techswitch-upihub-*-ios-unsigned.ipa is built by the iOS workflow without an Apple signature,
because the project has no Apple Developer account yet. iPhones only run signed apps, so install it
with a sideloading tool such as AltStore or Sideloadly, which signs it with your own Apple ID
(apps signed with a free Apple ID stop opening after 7 days until re-signed). iOS 16 or newer.
The iPhone app scans UPI QR codes and opens Google Pay, PhonePe and Paytm with documented links;
Kiwi, CRED, MobiKwik, Jupiter, BHIM and Amazon Pay use the common scheme://upi/pay form, and
"Any UPI app" hands the plain upi:// link to iOS. SHA256SUMS-ios lists the IPA checksum.