I messed up! Mistyped my passport number.

[bdigges]

I realized, to my ultimate dismay, that I mistyped my passport number on my visa application.

I notice it after I paid for it and printed out my online payment receipt, which also now has the wrong number, and now I'm not sure what to do.

Should I start over from square one?

Can I get the payment transferred to a new application?

Help!?