Update Adset and Campaign Budgets - https://mirigrowth.com/blog/automation-facebook-marketing-api-scripts

update-budgets.py

# Update Adset and Campaign Budgets

import requests
import json
import time

# Update with your Facebook Ad Account ID and Access Token
access_token = ''

# Update with a list of IDs and budgets to update
# Note: budgets are multipled by 100 e.g $100 should be 10000 via the API
to_update = [
    { 
        'id': '',
        'budget': ''
    }
]

for update in to_update:
    time.sleep(0.5)
    data_dump = {
        'daily_budget': update['budget'],
        'access_token': access_token
    }
    r = requests.post('https://graph.facebook.com/v4.0/' + update['id'], data=data_dump)
    result = r.json()
    if 'success' in result:
        print('Successfully updated ID: ' + update['id'])
    else:
        print('Error updating ID: ' + update['id'] + ', Error: ' + result['error']['message'])