It does not flow to the paypal balance / transaction history, thus why we need to connect the card directly.

I did call PayPal Support.  What a nightmare.  They told me to call Synchrony Bank support.  I called Synchrony Bank Support, they said they would connect me to PayPal Support, but a different department.  I connected to PayPal Support, some department, they told me that's not their department, connected me to another paypal department.  That PayPal department told me not their department, connected me to the first department.  This person once again told me not their department, connected me to another department.   This pattern continued for about 6 transfers to other departments, each time waiting on hold music for a long time, and nobody could seem to handle the very basic question of whether or not this card can connect or not.  Finally, after HOURS of transfers and hold music, I get re-connected to a department that I had already talked to, the gentleman seemed to actually be familiar with the issue after he was going to transfer me and I told him that I'd been transferred 6 times and am now on to him, so to please not transfer me again.  He told me it's not supported, because for a connection to be supported, a username and password has to exist, and it does not because of how it's set up.  He also told me it's not his department, so he can't really say more than that, but that he did know that was a known issue and that's why it can't work. 

Meanwhile, it already did work for a long time before it stopped working suddenly, so even that reason seems weak to me, since they already had a working integration and apparently got rid of it for some unknown reason.

Use the only known login - go to PayPal and then click through to log you into the Synchrony PayPal Mastercard account, (there is no actual username and login direct into synchrony), and the paypal login you use in the first place does not work with synchrony bank.  So, not supported.

I will be cancelling this card, after going through dozens of online accounts changing payment method one at a time.  What a frustrating experience and mess this has created for our books.

For anyone else having this issue, if you have this card, and need your transaction history in your Quickbooks, here's what you do:

The only way to get your transactions into Quickbooks, is to

1. Go to the PayPal account > CashBack Mastercard (Synchrony) account
2. find your statements 1 month at a time, and export them to a spreadsheet. 
3. Then, collect all of them into one sheet (there is no export all or date range export).  Use Google sheets or similar to get all the transactions into one list. 
4. Export that list to CSV. 
5. Then in Quickbooks, import the transactions manually under the connect menu in banking/transactions.  Map the columns accordingly matching them up, and it will import all the transactions.  If your card is already in your list of accounts, find it from your dashboard and then find the import transactions option.

Make sure if you have had this sync before, that you only have the transactions AFTER your last automatic sync'd transaction for the card - might be around May 2022, but just check what the last transaction was that did sync and delete that and anything before that from your exported transaction sheets list, so that you don't end up with duplicate transaction records.

Why this would work for year(s) and then suddenly stop working, I don't know, but it's a huge pain in the butt. 

Maybe they stopped supporting sync'd transaction history because it lets people who review their transactions to see proof of their scammy hidden fees!  Once reviewing your transaction, you may notice Synchrony Bank charging semi random amounts as "Card Security Fee" - I had charges every month, that I did not realize were there, sometimes more than once a month if I was paying the card off in advance, for anywhere from $17 - $25.  This is a fee they charge you based on your card balance.  Even if you have auto-pay enabled, and have paid on-time every month, it only auto-pays some of the current balance, not all of it, keeping the balance higher.  Not to mention they may be charging this fee before auto-pay executes so that it can charge more.  I think it might be possible to call and manually opt-out of this charge, which I wish I knew years ago, since I've paid hundreds of dollars in fees not realizing they were charging it. 

So much for getting "cash back".  More like cash to pay their hidden fees.  I don't even want to compare how much cash I got "back" vs how much I leaked from my account into their greedy pockets from this hidden security fee crap.  Garbage card, and garbage support.  Basically, the PayPal CashBack Mastercard by Synchrony Bank is a very well hidden scam, charging you to get the "cashback" to them instead of you via these fees.  If you're keeping this card you might want to look into the "opt out of security fee" number to call and remove this fee from your account.  Just the fact that you can opt out but only by phone should be a sign that it's designed to scam people.  Live and learn.