모델 생성 public class DeliveryModel { @SerializedName("MSG_ID") @Expose private String mSGID; } ApiService public interface ApiService { @FormUrlEncoded @POST("lst/101") Call getProduct(@Field("REQUEST") String request); @FormUrlEncoded @POST("lst/102") Call getDelivery(@Field("REQUEST") String request); @FormUrlEncoded @POST("ins/103") Call setOrder(@Field("REQUEST") String request); @FormUrlEncod..