公众号请求(CreateOfficialAccountPaymentRequest)

{
    "request_id": "string",
    "account_id": "string",
    "payment_type": "WECHAT_PAY",
    "payment_flow": "SCAN",
    "order_description": "string",
    "notify_url": "string",
    "payment": {
        "amount": 0,
        "currency": "string",
        "expiry_time": "2019-08-24T14:15:22.123Z"
    },
    "settlement": {
        "currency": "string"
    },
    "payment_params": {
        "success_url": "string",
        "failed_url": "string",
        "canceled_url": "string",
        "property1": "string",
        "property2": "string"
    },
    "metadata": {
        "property1": {},
        "property2": {}
    }
}