付款后获得价值

Question

我有以下对象。如何从中获取email值？

{
    "payment_method": "paypal",
    "payer_info": {
        "email": "example@domain.com",
        "first_name": "example",
        "last_name": "xxx",
        "payer_id": "12313213",
        "shipping_address": {
            "recipient_name": "Example",
            "id": "5435345",
            "line1": "1 SS ",
            "city": "San Jose",
            "state": "CA",
            "postal_code": "95131",
            "country_code": "US"
        },
        "phone": "4547567",
        "country_code": "US"
    }
}