Facebook Business API Custom Audience delete_users function not working

Question

I'm trying to remove users from an audience in the Facebook Ads API, using the delete_users function.

This is my code so far: '''

from collections import UserList
from facebook_business.adobjects.adaccount import AdAccount
from facebook_business.adobjects.customaudience import CustomAudience
from facebook_business.api import FacebookAdsApi
from facebook_business.api import FacebookRequest


access_token = 'XXX'

id =  'XXX' 

api = FacebookAdsApi.init(access_token=access_token)



fields = []
params = {
    'name': 'Test Audience',
    'subtype': 'CUSTOM',
    'description': 'People who purchased on my website',
    'customer_file_source': 'USER_PROVIDED_ONLY',
}
print ( AdAccount(id).create_custom_audience(
    fields=fields,
    params=params,
) )

fields = []
params = {
    'name': 'Test Audience',
    'payload': hashed_list_of_emails 
 }


CustomAudience.delete_users(
    self
    fields=fields,
    params=params,
    method='DELETE',
    endpoint='/users',
)

'''

I am receiving an error which tells me to replace self with node_id=self['id'], but I am unclear on what this is. I am also unclear on which part of the delete_users function should contain the audience_id, and where to insert the payload of the list of hashed email to remove from the audience.