A lot of people have already solved this but here is my 2 cents.

    wget https://gist.githubusercontent.com/jorin-vogel/7f19ce95a9a842956358/raw/e319340c2f6691f9cc8d8cc57ed532b5093e3619/data.json
    echo "Name,Credit Card" > `date +"%Y%m%d.csv"`
    jq -r '.[] | select(.creditcard) | .name+","+.creditcard' data.json >> !$