I received the following notification from PayPal:
We want to remind you about upcoming changes that may impact your Payflow integration. Because these changes are technical in nature, we advise that you consult with your partner, website vendor, or individuals responsible for your Payflow integration. They will be able to identify what, if any, changes are needed. Please forward the information below to your technical contact for evaluation. We’re here to help your technical contact to ensure you continue to process payments through your current integration with us. The following Payflow URLs are scheduled to be deprecated on August 3, 2015:
If you’re currently integrated with one of these URLs, you’ll need to update your integration to the corresponding paypal.com URL. Not doing so may impact your ability to accept and process payments. This won't have any adverse side effects in your site.
Blackbaud has verified that we do not use any of those URLs and no action is necessary to prevent payment processing issues.