I have just stepped through the PayPal Express Checkout Digital Goods integration wizard at https://devtools-paypal.com/integrationwizard/ecdigitalgoods.
I am having what might be a Chrome-specific issue.
When one clicks the "Pay with PayPal" button, as expected, a new browser window opens and happily reports that it is "loading," but just when one might expect to see a page, Chrome reports that the "The webpage is not available."
The page Chrome was trying to load is https://www.sandbox.paypal.com/incontext?token=....
Ultimately, this seems to be a ERR_CONNECTION_RESET problem.
Visiting the same page in Safari does not create the error, but rather allows for the payment as expected.
Has anyone had a similar issue in Chrome or other browsers? Can you suggest a solution?