What you describing can be done - but it is not a "simple solution". The XML submission in Zen specifically crafts it as a sale (authorize and charge). One could re-write the XML message to be an authorize only - but that would then burden the merchant with going back to each of those and capturing the charge. There is no admin screen to do that - nor a database to keep track of outstanding "auth" transactions. If this is the objective - I would want to do that directly in QB, as it has the API to submit and track and capture those outstanding auth transactions.
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