Get existing subscription

{
    "id": "04033961-7c2d-4c3c-99f5-d1746c73ddb0",
    "subscriptionPlanId": "c9799996-f778-4eb3-9d0a-47bad3b11075",
    "status": "active",
    "reference": null,
    "customerData": [
        {
            "type": "name",
            "value": "John Smith"
        },
        {
            "type": "email",
            "value": "johnsmith@example.com"
        }
    ],
    "link": "https://lopay.app/00000/04033961-7c2d-4c3c-99f5-d1746c73ddb0",
    "latestInvoice": {
        "id": "79437e39-2576-4daa-9a2b-3e02dacb707c",
        "subscriptionId": "04033961-7c2d-4c3c-99f5-d1746c73ddb0",
        "status": "paid",
        "invoiceDate": "2025-05-14T23:00:00.000Z",
        "total": {
            "units": 100,
            "currencyCode": "GBP"
        },
        "taxes": [],
        "payment": {
            "id": "12bd0d11-fd9a-42cd-9c97-7f8744305b65",
            "type": "card",
            "cardDetails": {
                "country": "US",
                "lastFour": "4242",
                "type": "visa"
            },
            "taxes": [],
            "tip": {
                "units": 0,
                "currencyCode": "GBP"
            },
            "subtotal": {
                "units": 100,
                "currencyCode": "GBP"
            },
            "total": {
                "units": 100,
                "currencyCode": "GBP"
            },
            "createdAt": "2025-05-15T10:35:11.146Z",
            "updatedAt": "2025-05-15T10:35:11.146Z"
        },
        "latestPaymentAttempt": "2025-05-15T09:35:06.627Z",
        "createdAt": "2025-05-15T09:35:05.317Z",
        "updatedAt": "2025-05-15T09:35:14.360Z"
    },
    "cancelledAt": null,
    "createdAt": "2025-05-15T09:35:05.314Z",
    "updatedAt": "2025-05-15T09:35:14.319Z"
}