Event error codes

If the vendor communicates a failure when processing information from AppDirect, one of the following error codes must be returned:

Error Code	Description
USER_ALREADY_EXISTS	This error code is typically used when AppDirect administrators try to buy subscriptions for apps they have already purchased directly from the application vendor. In this scenario, we will show the user an error message and prompt them to link their account.
USER_NOT_FOUND	This error code is typically used when AppDirectadministrators try to unassign users not found in the Vendor's account.
ACCOUNT_NOT_FOUND	This error code is typically used when AppDirect administrators try to add or remove users from an account not found in the Vendor's records.
MAX_USERS_REACHED	This error code is typically used when AppDirect administrators try to assign users beyond the limit of the number of seats available. AppDirect will typically prevent that from happening by monitoring application usage.
UNAUTHORIZED	This error code is returned when users try any action that is not authorized for that particular application, for example, if an application does not allow the original creator to be unassigned.
OPERATION_CANCELLED	This error code is returned when a user manually interrupts the operation (for example, by clicking cancel on the account creation page).
CONFIGURATION_ERROR	This error code is returned when the vendor endpoint is not currently configured.
INVALID_RESPONSE	This error code is returned when the vendor was unable to process the event fetched from AppDirect.
PENDING	This error code is returned when the vendor was unable to process the event because the service is under provisioning.
FORBIDDEN	This error code is returned when the operation is not allowed.
BINDING_NOT_FOUND	This error code is returned when the specified binding cannot be found.
TRANSPORT_ERROR	This error code is returned when there is a transport error, such as the server is unreachable.
UNKNOWN_ERROR	This error code may be used when none of the other error codes apply.