[O] Reduce duplicate code

src/main/java/icu/samnyan/aqua/sega/billing/BillingResponse.java

@@ -0,0 +1,42 @@
+package icu.samnyan.aqua.sega.billing;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+/**
+ * @author samnyan (privateamusement@protonmail.com)
+ */
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class BillingResponse {
+    private int result;
+    private int waittime;
+    private int linelimit;
+    private String message;
+    private int playlimit;
+    private String playlimitsig;
+    private String protocolver;
+    private int nearfull;
+    private String nearfullsig;
+    private int fixlogcnt;
+    private int fixinterval;
+    private String playhistory;
+
+    @Override
+    public String toString() {
+        return "result=" + result +
+                "&waittime=" + waittime +
+                "&linelimit=" + linelimit +
+                "&message=" + message +
+                "&playlimit=" + playlimit +
+                "&playlimitsig=" + playlimitsig +
+                "&protocolver=" + protocolver +
+                "&nearfull=" + nearfull +
+                "&nearfullsig=" + nearfullsig +
+                "&fixlogcnt=" + fixlogcnt +
+                "&fixinterval=" + fixinterval +
+                "&playhistory=" + playhistory;
+    }
+}