We are a big webshop provider, and we have thousands of webshops in our system.

We have a case where we get an error in DoExpressCheckout with PaymentAction of Authorization here is the error

```
Ack: FAILURE

Build: 000000

Version: 117.0

Timestamp: 2017-04-06T08:54:36Z

CorrelationID: 4d6d16d1d30fa

ErrorCode: 10423

SeverityCode: ERROR

ShortMessage: Transaction refused because of an invalid argument. See additional error messages for details.

LongMessage: This transaction cannot be completed with PaymentAction of Authorization.

```

We have no clue what is wrong. Because it happens for specific paypal account of a specific customer.

We have two shops / one of a customer of us. Where we get the error. We made another shop in our system where we connected a paypal verified business account and then with another real personal account we bought an item from that shop and it all works. No errors.

We tried to the the same for this problematic customer and we get the error. We are sure that the code we use is the same in both cases and there is no difference in our handling. So the question is what could be wrong on the other paypal business account?

Could it be an SDK problem?