code: public byte[] getProfileImage(String accountId, String userId) throws ApiException {
      return getProfileImage(accountId, userId, null);
    }
docs: Retrieves the user profile image for the specified user.
  Retrieves the user profile picture for the specified user. The image is returned in the same format as uploaded.  The userId parameter specified in the endpoint must match the authenticated user&#39;s user ID and the user must be a member of the specified account.  If successful, the response returns a 200 - OK and the user profile image.
  @param accountId The external account number (int) or account ID Guid. (required)
  @param userId The user ID of the user being accessed. Generally this is the user ID of the authenticated user, but if the authenticated user is an Admin on the account, this may be another user the Admin user is accessing. (required)
  @return byte[]