code: public static CredentialCreator creator(final String pathAccountSid, 
                                              final String pathCredentialListSid, 
                                              final String username, 
                                              final String password) {
          return new CredentialCreator(pathAccountSid, pathCredentialListSid, username, password);
      }
docs: Create a CredentialCreator to execute create.
  
  @param pathAccountSid The unique id of the Account that is responsible for
  this resource.
  @param pathCredentialListSid The unique id that identifies the credential
  list to include the created credential
  @param username The username for this credential.
  @param password The password will not be returned in the response.
  @return CredentialCreator capable of executing the create