问题
We have been developing with Fastlink off the dev sandbox (while we wait for our private zone and public zone Fastlink keys) and are running into an issue. Callback isn't occurring after a brokerage account is successfully linked to an account. We are, however, receiving a callback to our specified callback URL when we pass invalid keys, or an invalid nonce. Do you know what might be causing this issue?
回答1:
Since Dev sandbox is for testing , the fastlink's close button has be removed and hence you are not able to go back to call back URL because you need to click on the close buttons to go to call back URL.
In your private and public Zone you will have those buttons enabled and hence you will be able to navigate to call back URL upon completion of link account process.
来源：https://stackoverflow.com/questions/24895610/yodlee-fastlink-callback-issues