1. A method, comprising: receiving, at a computing device, a request for a transaction; after receiving the request for the transaction, generating, by the computing device, a 2D barcode code onto a transaction receipt, wherein the 2D barcode includes first information uniquely identifying the requested transaction; storing, at a storage device, second information uniquely identifying the requested transaction; determining, by the computing device, that an error of an error type has occurred during the requested transaction; receiving, at the computing device, an error identifier assigned to the error type, wherein the second information stored at the storage device includes the error identifier; receiving, from a user device, a call session request, wherein the call session request includes the first information; determining, based on the call session request, that a user associated with the user device is authenticated; and in response to determining that the user is authenticated, retrieving the second information.