The decision on the winner of the Bayley vs. Alexa Bliss match at Payback was changed four times over the last 30 or so hours before the match, according to the Wrestling Observer Newsletter.
As of Saturday afternoon, the plan was for Bayley to retain the title in her hometown of San Jose. The planned result then changed three more times on Sunday and WWE decided to go with their usual pick of having a person lose in their hometown. It seems weird to just decide to put the title on Alexa Bliss at the last minute, so it is possible that they planned for Alexa to win it soon (maybe even the next night on Raw) anyway.
Another Payback match result that was changed at the last minute was the Neville vs. Austin Aries match, which originally had Neville winning in some capacity. It was then changed to having Aries win by DQ, with the thought probably being that they’re likely extending their feud and having Neville win twice in a row doesn’t look good for Aries.