I realized Plastiq has a lot of technical issues.

With Masterpass, I set up with 3 banks with 3 MCs. But in Plastiq, only one is selected and I can't change it. Say, I have Masterpass with BA, City and Chase. Only Masterpass BA is available, hard-coded. I can't switch CCs. There is no pending or scheduled payments.

Plastiq still relied on paper check. This is just amazing....