interface RoyalPayApi {

@FormUrlEncoded
@Headers("Accept: application/json", "Content-Type: application/json")
@PUT("/api/v1.0/gateway/partners/{partner_code}/app_orders/{order_id}")
fun createRoyalPaySDKOrder(@Path(value = "partner_code", encoded = true) partner_code: String, @Path(value = "order_id", encoded = true) order_id: String,
                           @Query("time") time: Long, @Query("nonce_str") nonce_str: String, @Query("sign") sign: String,
                           @Field("description") description: String,
                           @Field("price") price: Int,
                           @Field("currency") currency: String,
                           @Field("channel") channel: String,
                           @Field("operator") operator: String,
                           @Field("system") system: String): Call<JSONObject> // com.alibaba.fastjson.JSONObject

fun createService(): RoyalPayApi {
        val retrofit = Retrofit.Builder()
        .baseUrl(ROYAL_PAY_ADDRESS)
        .addConverterFactory(FastJsonConverterFactory.create())
        .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
        .build()

    return retrofit.create(RoyalPayApi::class.java)
}

var api = createService()
    var call = api.createRoyalPaySDKOrder(ROYAL_PAY_PARTNER_CODE, order_id, time, ROYAL_PAY_NONCE_STR, sign,
        description, price, "AUD", channel, "kate", "android")

    call.enqueue(object : Callback<JSONObject>{
        override fun onResponse(call: Call<JSONObject>, response: Response<JSONObject>) {
            val str = ""
        }

        override fun onFailure(call: Call<JSONObject>, t: Throwable) {
            val str = ""
        }
    })