Part of stoqlib.domain.events
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This event is emmited when a payment is about to be created and should
be used to 'intercept' that payment creation.
return value should be one of
|Parameters||payment_method||The selected payment method.
|sale||The sale the payment should belong to
API Documentation for Stoqlib, generated by pydoctor at 2009-07-14 16:00:32.