where, what form do I look at to see how much was paid electronically with the extension?

[sjrcpa]

The client looks at their bank statement.

[IRonMaN]

"The client looks at their bank statement."

And then the tax preparer looks at the bank statement because the client couldn't figure it out. 😁

[George4Tacks]

This may help. I circled in red where YOU need to enter the amount the really happened, by confirming with your client. Yellow is what should be, but stuff happens.