Store payment request transaction status

[chill117]

• pending - Waiting for payment
• unconfirmed - Received a payment but its transaction is still unconfirmed
• confirmed - Received a payment and its transaction was confirmed in a block. This will be done in the background of the app. Periodically, "unconfirmed" transactions should be checked to see if the received transaction has been confirmed in a block. If yes, then mark the payment request as "confirmed".
• canceled - When the user clicks the "Cancel" button (if the payment request was created - 5 seconds had passed)
• timed-out - Timed out while waiting to receive a payment. A payment request can be marked as "timed-out" after 5 minutes of waiting. This should be configurable (app.config.<something>)

[karliatto]

Since currently we have web socket for checking payment when would be time-out? here and when closing the view ?

[chill117]

The remaining status (confirmed) can be moved to the next phase.