This method retrieved a list of all the contacts who hard bounced when sent a specified campaign along with any specified data labels.
||This is the username from your API key. It is in the format of an email address and will look similar to apiuser‑firstname.lastname@example.org
||This is the password from your API key.
||This is the Id of the campaign you wish to query against.
||The names of the data fields you want to get the data for.
The result is an array of contact objects.