The members resource provides an endpoint for fetching, creating, and updating member data. Fetch members (by default, the 15 newest members are returned): 
// GET /admin/members/?include=newsletters%2Clabels
{
    "members": [
        {
            "id": "623199bfe8bc4d3097caefe0",
            "uuid": "4fa3e4df-85d5-44bd-b0bf-d504bbe22060",
            "email": "jamie@example.com",
            "name": "Jamie",
            "note": null,
            "geolocation": null,
            "created_at": "2022-03-16T08:03:11.000Z",
            "updated_at": "2022-03-16T08:03:40.000Z",
            "labels": [
                {
                    "id": "623199dce8bc4d3097caefe9",
                    "name": "Label 1",
                    "slug": "label-1",
                    "created_at": "2022-03-16T08:03:40.000Z",
                    "updated_at": "2022-03-16T08:03:40.000Z"
                }
            ],
            "subscriptions": [],
            "avatar_image": "https://gravatar.com/avatar/76a4c5450dbb6fde8a293a811622aa6f?s=250&d=blank",
            "email_count": 0,
            "email_opened_count": 0,
            "email_open_rate": null,
            "status": "free",
            "last_seen_at": "2022-05-20T16:29:29.000Z",
            "newsletters": [
                {
                    "id": "62750bff2b868a34f814af08",
                    "name": "My Ghost Site",
                    "description": null,
                    "status": "active"
                }
            ]
        },
        ...
    ]
}

​
Subscription object

A paid member includes a subscription object that provides subscription details. 
// Subscription object
[
    {
        "id": "sub_1KlTkYSHlkrEJE2dGbzcgc61",
        "customer": {
            "id": "cus_LSOXHFwQB7ql18",
            "name": "Jamie",
            "email": "jamie@ghost.org"
        },
        "status": "active",
        "start_date": "2022-04-06T07:57:58.000Z",
        "default_payment_card_last4": "4242",
        "cancel_at_period_end": false,
        "cancellation_reason": null,
        "current_period_end": "2023-04-06T07:57:58.000Z",
        "price": {
            "id": "price_1Kg0ymSHlkrEJE2dflUN66EW",
            "price_id": "6239692c664a9e6f5e5e840a",
            "nickname": "Yearly",
            "amount": 100000,
            "interval": "year",
            "type": "recurring",
            "currency": "USD"
        },
        "tier": {...},
        "offer": null
    }
]
KeyDescription
customerStripe customer attached to the subscription
start_dateSubscription start date
default_payment_card_last4Last 4 digits of the card
cancel_at_period_endIf the subscription should be canceled or renewed at period end
cancellation_reasonReason for subscription cancellation
current_period_endSubscription end date
pricePrice information for subscription including Stripe price ID
tierMember subscription tier
offerOffer details for a subscription