func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {
    if url.host == "BigoClient" {
        //TODO:此处处理回调结果
        print("此处处理回调结果")
    }
    return true
}

URL Schemes "OtherApp"
LSApplicationQueriesSchemes 白名单 添加 "BigoClient"

    import BGPay

    let appId = "123456789"
    let mchId = "123456789"
    let nonceStr = "58685768576309403"
    let outTradeNo = "test123"
    let totalFee = "2.3456"
    let notifyUrl = "www.baidu.com"

    let order = BGPayOrder()
    order.appId = appId
    order.mchId = mchId
    order.nonceStr = nonceStr
    order.outTradeNo = outTradeNo
    order.totalFee =  totalFee
    order.notifyUrl = notifyUrl

    BGPay.shared().payOrder(order: order, scheme: "OtherApp",successCallback: { (result) in
        print(result)
    }) { (result, error) in
        print(error?.errorMessage ?? "")
    }

    import BGPay
    
    let appId = "123456789"
    let mchId = "123456789"
    let nonceStr = "58685768576309403"
    let outTradeNo = "test123"
    let totalFee = "0.01"
    let phone = "13315999725"
    let countryCode = "+86"

    let withDraw = BGWithDraw()
    withDraw.appId = appId
    withDraw.mchId = mchId
    withDraw.nonceStr = nonceStr
    withDraw.outTradeNo = outTradeNo
    withDraw.phone = phone
    withDraw.countryCode = countryCode
    withDraw.totalFee =  totalFee

    BGPay.shared().withDraw(order: withDraw, successCallback: { (result) in
        print(result)
    }) { (result, error) in
        print(error?.errorMessage ?? "")
    }

pod 'BGPaySDK'