| 10001 | Internal error |
| 10002 | Incorrect username / password |
| 10009 | Cannot perform refund |
| 10201 | Agreement canceled |
| 10204 | Denied |
| 10207 | Retry |
| 10212 | Profile preference setting |
| 10321 | Account does not have sufficient funds to implement this mass payment. |
| 10409 | Express Checkout token was issued for a merchant account other than yours. |
| 10410 | Invalid token |
| 10411 | Express checkout session has expired. Token value is no longer valid. |
| 10414 | Transaction refused because of an invalid argument. See additional error messages for details. |
| 10417 | Transaction cannot be completed with the payment method selected by the customer. Instruct the customer to retry the transaction using an alternative payment method from their PayPal wallet. |
| 10422 | The customer must return to PayPal to select new funding sources. |
| 10433 | Transaction refused because of an invalid argument. See additional error messages for details. |
| 10485 | Payment has not been authorized by the user. |
| 10486 | Transaction could not be completed. Redirect your customer to PayPal. |
| 10606 | Transaction rejected; contact the buyer. |
| 10755 | Unsupported currency |
| 11451 | Billing Agreement ID or transaction ID is not valid. |
| 11607 | A successful transaction has already been completed for this token. |
| 13602 | Refund failed due to insufficient funds in your PayPal account. |
| 13113 | The Buyer cannot pay with PayPal for this transaction. |
| 13122 | Transaction cannot be completed because it violates the PayPal User Agreement. |
| 81253 | Missing Parameter |
