TTB App supports paying both MEA and PEA bills. It seems directly linked to MEA and PEA and shows the amount owing once the bill in the system the next day after read the meter. If you save as favorites in the app and it takes less 10sec to pay a bill and it saves the receipt on your phone. I have also use the Bangkok bank for MEA, The TTB app is year ahead of Bangkok banks app. I not used Kbank app for much so no experience there.