PAYPAL ERROR Message, Please Help

i configured the PayPal Express checkout as well as PayPal Direct, and testing it on sandbox

Now i wanted to test it with the live paypal environment, i unchecked "Use Sandbox" from the Admin section payment area

Now when i added products in the card and clicked on checkout

Now different payment methods appears along with Paypayl checkout button

i clicked on paypal checkout

I got this error:

LongMessage: Security header is not valid
ShortMessage: Security error
ErrorCode: 10002

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: NopSolutions.NopCommerce.Common.NopException:
LongMessage: Security header is not valid
ShortMessage: Security error
ErrorCode: 10002



PLEASE HELP

I got this error too with the 'Use Sandbox' checked

I got the same error, I have selected the paypal direct and the paypal express payment types, I got the User name password and signature from my paypal bussines account under profile and API Access. I have the sandbox option selected. I would appreciate any information you can provide in regards this issue.

spherenetcom wrote:

if your API credentials are for your real paypal account, you must unselect 'use sandbox'

if you are using sandbox, you need to set up completely different paypal test account (search paypal for 'sandbox')