Most of the time, a Plentific Pro will send an invoice for a job once the work itself has been completed.
However, this may not always be practical. For example, if you the job in question will take several weeks, you may not be able to wait to collect the payment in full at the end. Because of this, Plentific Pros can send an invoice at any point after a job begins.
Keep in mind that you and your customer will need to agree on a payment structure in advance. Plentific will also keep a record of how much money you have received for each job.