diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index 3b9d0f5..91cbd61 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -249,4 +249,20 @@
 # Keep annotation-based bindings
 -keep @javax.inject.Inject class * { *; }
 -keep @dagger.Provides class * { *; }
--keep @dagger.Module class * { *; }
\ No newline at end of file
+-keep @dagger.Module class * { *; }
+
+# Keep Nexgo SDK
+-keep class com.nexgo.** { *; }
+
+# Keep DDI interface (VERY IMPORTANT)
+-keep class com.xinguodu.ddiinterface.** { *; }
+
+# Keep printer implementations
+-keep class com.nexgo.oaf.apiv3.device.printer.** { *; }
+
+# Prevent method shrinking/optimization
+-dontoptimize
+-dontshrink
+
+-dontwarn com.xgd.smartpos.manager.app.UsageInfo
+-dontwarn com.xgd.smartpos.manager.app.UsageStats
\ No newline at end of file
diff --git a/paylibs/proguard-rules.pro b/paylibs/proguard-rules.pro
index b469731..b81aa11 100644
--- a/paylibs/proguard-rules.pro
+++ b/paylibs/proguard-rules.pro
@@ -36,4 +36,20 @@
 # Keep specific classes from okhttp3.internal.platform
 -keep class okhttp3.internal.platform.BouncyCastlePlatform { *; }
 -keep class okhttp3.internal.platform.ConscryptPlatform { *; }
--keep class okhttp3.internal.platform.OpenJSSEPlatform { *; }
\ No newline at end of file
+-keep class okhttp3.internal.platform.OpenJSSEPlatform { *; }
+
+# Keep Nexgo SDK
+-keep class com.nexgo.** { *; }
+
+# Keep DDI interface (VERY IMPORTANT)
+-keep class com.xinguodu.ddiinterface.** { *; }
+
+# Keep printer implementations
+-keep class com.nexgo.oaf.apiv3.device.printer.** { *; }
+
+# Prevent method shrinking/optimization
+-dontoptimize
+-dontshrink
+
+-dontwarn com.xgd.smartpos.manager.app.UsageInfo
+-dontwarn com.xgd.smartpos.manager.app.UsageStats
\ No newline at end of file