You got me here to help you connect Braintree account in QuickBooks Online, usereva.
You can connect the account the same way on how to connect your bank in QBO. Or through Sync with PayPal, PayPal Bank Feeds, or Connect to PayPal app. You may choose the first or third option I've mentioned.
You can start connecting by going to the Apps menu and finding Connect to PayPal or Sync with the PayPal app. I have here some resources that provide more details about this:
Thanks! How do I do it for Stripe? It won't interphase when I try to do it like I do when connecting bank accounts. I found Synder, which works well, but is $15 per month after the trial period. Is there a free alternative?