One would normally pay after e-filing (or arrange a Direct-Debit as a part of the e-file)...
Why?
If your e-file is rejected, the corrections made to get it to e-file might also change the amount due....either more.....or less.
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If a D-Debit is arranged as a part of your e-file, and the e-file is Rejected, then the D-Debit is not implemented......only with an Accepted e-file will the D-Debit be implemented.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
