This is pretty complicated. And for the record, this should not be necessary. Mistakes should be caught before a campaign goes live, and reports should be checked the next day to stave off human error. But for those unavoidable circumstances... the following steps should work to change the cost of a completed item.
1. Extend the date out. This is what brings it back alive.
2. Pause it immediately. We will have now delivered 1 extra day (if the item completed yesterday) but no extra impressions. The number of days matters if you're updating a Sponsorship, which is based on CPD summed across all days of a campaign. If we didn't catch the error for 2 weeks, we've now delivered 14 extra days when we reactivate later on; we'll need to account for this.
3. Change the cost. If you used a Sponsorship, the 1 extra add 1 day to the timeframe in your cost calculation to account for the days between the ending and when you just-reactivated it.
5. Re-run the report. The historical timeframe should not care about the new day we've just added in the current time period. We'll take care of that next.
4. Add a discount to make the extra day free. If this was one day in a 30 day month, the discount is 1/30 or .0333 repeating. We don't want to charge the customer for our error.
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