In large enterprise sales, you would typically structure the payments into various milestones. You may be able to invoice the first one before you actually giv

In large enterprise sales, you would typically structure the payments into various milestones. You may be able to invoice the first one before you actually give them anything but there is a vanishingly small chance of collecting the full payment until well after the product is deployed, probably in-use and occasionally after demands for features that were not agreed upon have been delivered.