Had a side window replaced so no glue involved, but they brought their own canopy to the office car park. Came twice - once on the day of the breakage to cut & fit a piece of plexiglass, then back the next day with the glass they had ordered. All easy, don't worry about the payment side, sounds like covering their backs. So long as you don't have horizontal rain on the day all will be fine. Any bonded glass puts the vehicle out of action for 24 hours.
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TG