https://xxxxxx/v4/official_account_open_http_svc/add_subscriber?sdkappid=88888888&identifier=admin&usersig=xxx&random=99999999&contenttype=json

{
    "Official_Account": "@TOA#_@TOA#dOEF",		// The desired official channel (required)
    "SubscriberList": [		// Up to 100 subscribers can be added at a time.
        {
            "Subscriber_Account": "107867"	// UserID of the subscriber to be added
        },
      	{
            "Subscriber_Account": "966582476"
        }
    ]
}

{
    "ActionStatus": "OK",
    "ErrorInfo": "",
    "ErrorCode": 0,
    "SubscriberList": [
        {
            "Subscriber_Account": "107867",
            "Result": 2
        },
        {
            "Subscriber_Account": "966582476",
            "Result": 1		// Addition result. 0: failed; 1: succeeded; 2: already subscribed.
        }
    ]
}