Getting Pledge History (Python or generic request)

Hello,
I’m trying to figure out how to get the pledge history for a member of a campaign. I’ve tried
campaign = api_client.get_campaigns_by_id_members(campaign_id, page_size=50, cursor=cursor,
fields={‘member’: [
‘pledge_history’,
]})
and it returns that pledge_history is not a valid field. The library doesn’t mention pledge_history or pledge events, and I can’t figure out how to get them. I finally figured out how to get the pledge_history of the user using a request, but I need the details from pledge event and don’t know what endpoint to get it from.

suffix = "campaigns/{}/members?include=pledge_history".format(campaign_id)
        response = requests.get(
            "https://www.patreon.com/api/oauth2/v2/{}".format(suffix),
            headers={
                'Authorization': "Bearer {}".format(access_token),
                'User-Agent': "Patreon CGT",
            }
        )
        campaign = response.json()

Please let me know what endpoint to use for this information