feat(core): Implement PaymentNotification validation.

core/embed/upymod/qstrdefsport.h

@@ -143,6 +143,7 @@ Q(apps.misc.cipher_key_value)
 Q(apps.misc.get_ecdh_session_key)
 Q(apps.misc.get_entropy)
 Q(apps.misc.get_firmware_hash)
+Q(apps.misc.payment_notification)
 Q(apps.misc.sign_identity)
 Q(apps.nostr)
 Q(apps.nostr.get_pubkey)
@@ -227,6 +228,7 @@ Q(omni)
 Q(ownership)
 Q(passphrase)
 Q(paths)
+Q(payment_notification)
 Q(payment_request)
 Q(pin)
 Q(progress)

core/src/apps/misc/payment_notification.py

@@ -0,0 +1,25 @@
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from trezor.messages import PaymentNotification, Success
+
+    from apps.common.keychain import Keychain
+
+from apps.common.keychain import with_slip44_keychain
+
+
+@with_slip44_keychain(slip44_id=0, slip21_namespaces=[[b"SLIP-0024"]])
+async def payment_notification(msg: PaymentNotification, keychain: Keychain) -> Success:
+    from trezor.messages import Success
+    from trezor.wire import DataError
+
+    from apps.common.payment_request import PaymentRequestVerifier
+
+    if msg.payment_req is None:
+        raise DataError("Missing payment request.")
+
+    PaymentRequestVerifier(msg.payment_req, 0, keychain).verify()
+
+    # TODO Show payment request memos.
+
+    return Success()