Entire database (too large): https://www.quandl.com/data/WIKI/documentation/bulk-download
Just the last day: https://www.quandl.com/api/v3/databases/WIKI/data?api_key=myAPIkey&download_type=partial
One day in the past for all stocks: ?????
It does not seem possible according to Quandl. There is no parameter for the date. Only partial or complete.
The python code is:
import quandl quandl.ApiConfig.api_key = 'XXXXX' quandl.bulkdownload("WIKI",download_type="partial",filename="./WIKI.zip")