I am using paypal advanced payment gateway in my site.
After selecting paypal advanced, we can see the iframe in checkout page.
Once we filled the iframe and click on pay, we are getting below error.
“Some required information is missing or incorrect. Please correct the fields below and try again.
Error: An error has occurred. Please contact the system administrator. “
We are facing this issue only in sandbox account in live account working fine.
Can you help me with this error?