Update on my original post: I called paypal support and explained my situation. They said they could fix my issue, but it would take several billing cycles because the transaction in question was made shortly before synchrony took over. I was fine with that, but it would have caused interest to be charged on an amount that should have been interest free for five more months. They asked me to call back in a few days, so I did. They transferred me to someone else that was able to set up a balance adjustment under a new same-as-cash term. This allowed me a few months for them to fix everything while not requiring me to pay off everything.
I waited a few weeks and was surprised to see a lot of changes made sooner than they promised. However, there were still issues and I was still going to owe interest I shouldn't have. I had to call back two more times to finally get everything solved. I ended up paying off all but one promo just to avoid possible issues.
I was very hesitant to use the service again after all the issues, but I gave it a shot anyway. I purchased some things for my bathroom remodel, then carefully watched the account. The new charge appeared correctly. A month later, I made a payment, and several days later it had been applied the same way they were pre synchrony. The majority of th payment was applied to the oldest purchase, and the minimum was applied to the newest. Glad to see it back to logical.
