There have been some related but different threads in the past.
A lookup table was apparently created in a Google Group thread but none is to be seen - https://groups.google.com/forum/#!category-topic/translink-australia-opendata/go-card/duv2yA_2wLA
An aggregated Origination-Destination trip is available with the updated GTFS station coding - but there is no lookup between that and the old (e.g. C15) coding scheme.
https://www.data.qld.gov.au/dataset/go-card-transaction-data
Past relevant requests
There have been some related but different threads in the past.
A lookup table was apparently created in a Google Group thread but none is to be seen - https://groups.google.com/forum/#!category-topic/translink-australia-opendata/go-card/duv2yA_2wLA
An aggregated Origination-Destination trip is available with the updated GTFS station coding - but there is no lookup between that and the old (e.g. C15) coding scheme.
https://www.data.qld.gov.au/dataset/go-card-transaction-data