Abstract: A method is disclosed and includes receiving, by a record server computer from a first processing network computer, a token, a device identifier associated with a user device, a session identifier associated with a registration request, and metadata about the token, and then receiving a metadata request from a second processing network computer in response to the second processing network computer receiving an authorization request message comprising the token, and the device identifier and/or the session identifier. The metadata request comprises at least the device identifier and/or the session identifier. The method also includes retrieving, by the record server computer, metadata associated with the metadata request, and providing the metadata to the second processing network computer. The second processing network computer processes the authorization request message using the token and the metadata.

Abstract: A method, system, and computer program product is provided for generating enhanced n-gram models for use with monitoring systems. The method includes determining that a leading pair of characters of a first data string does not match a leading pair of characters of a second data string and inserting a placeholder character at a first-index position in each data string. The method further includes inserting a placeholder character between each character pair of the first data string in which a first character matches a character of the second data string at a same index position and in which a second character matches a character of the second data string at an index position immediately following a same index position, and generating a similarity score based on the length of the data strings and triggering a remedial process in response to the similarity score exceeding a predetermined threshold.