You can use your phone to pay with passport parking. You have to find the Zone # which is on the parking meter on the front. On the app you can preload your plate, car, and credit card. For my one hour of parking it was $1.20 for an additional fee of $0.20. The app worked well and gave a count-down and 15 minute warning. However I still received a printed warning for not paying.
I'm sure if it was a ticket I could easily contest it with the emailed parking receipt and app history but there still seems to be a disconnect between the app and the parking enforcement force.
I did submit a bug report. On the warning there is no website or contact information to contest or discuss the warning.
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