That is not possible in Tempo. You can export Account reports as pdf that you can use with an invoice
you can generate custom timesheets (and invoices) from worklog data using the PDF View Plugin. there is already a default PDF template shipped with the plugin, which can be used as a great starting point.
that template exports the data stored in the standard built-in JIRA worklogs. I'm not familiar with Tempo, if it uses some other ways to persist its own worklog data, then the PDF template needs to be adapted. (you basically need to write a Groovy script to access the Tempo data, then use that script in the PDF template. see this tutorial.)
here is an example PDF, generated from the default timesheet/invoice template:
Just a comment: one of the JIRA PDF View Plugin users is connecting to Tempo by sending HTTP requests to Tempo's servlet API and by processing the resulted XML. This can be done by some short Groovy scripts.
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