I've been using Paypal Merchant SDK with Sandbox credentials for last few months and everything for working fine.
But today, Im facing this strange problem, whenever I make an API call of SetExpressCheckout, I get Transaction failed due to internal error with error code 10001 .. I haven't changed anything in code, it just started to show up.
Im using the github api for transaction: https://github.com/paypal/merchant-sdk-php/]1
Here is the API Error Response
SetExpressCheckoutResponseType Object
(
[Token] =>
[Timestamp] => 2013-09-15T07:33:51Z
[Ack] => Failure
[CorrelationID] => 1325627aefe46
[Errors] => Array
(
[0] => ErrorType Object
(
[ShortMessage] => Internal Error
[LongMessage] => Transaction failed due to internal error
[ErrorCode] => 10001
[SeverityCode] => Error
[ErrorParameters] =>
)
)
[Version] => 94.0
[Build] => 7645184
)