Please submit all issues for the PokemonTCG API here.
If you find issues with the data, please submit pull requests here: https://github.com/PokemonTCG/pokemon-tcg-data/
All releases for the API will be documented in the CHANGELOG.md file. If you are interested in contributing to the API, feel free to contact me at backes.andrew@gmail.com.
The best way to contribute right now is by creating/enhancing developer SDKs and fixing/adding data.