Data Center Integrated Systems Test Signoff Missing Before Final Payment Email Template

Use this page when final payment is delayed because the buyer says the integrated systems test signoff, IST approval record, or data-center end-to-end test acceptance is still missing. This is different from a single-system commissioning issue because it focuses on the coordinated proof that power, cooling, controls, alarms, and support systems have been tested together under the agreed scenario. The commercial problem is that individual packages may already be signed off, but the payer is still holding the closeout balance until the integrated test is approved. Your email should ask whether IST approval is the only remaining blocker, whether the full test sequence has already been completed, what scenario or witness comment is still open, and whether payment will be released once that signoff is granted. The outcome you want is to tie the delay to one specific integrated test approval instead of generic data-center completion comments.