Labour says there was political interference in a decision to allow Snapper to be part of an integrated ticketing system on public transport in Auckland.
Auckland Transport later terminated the contract because the company could not meet its deadline.
Labour's Transport spokeperson, Phil Twyford has obtained documents under the Official Information Act which he says shows former Transport Minister Steven Joyce was deeply involved in the negotiations with Snapper.
Current Transport Minister Gerry Brownlee says Mr Twyford is engaged in a creative cut and paste exercise of the information and his claims have no validity.
The documents include a letter dated 17 March 2010, from Snapper to Mr Joyce thanking him for meeting them the previous week.
Auckland Chamber of Commerce chief executive Michael Barnett said it's not surprising that Snapper would have been heavily lobbying the Government.