Return empty PayU settings when not configured

src/main/kotlin/com/android/trisolarisserver/controller/PayuSettingsController.kt

@@ -35,7 +35,17 @@ class PayuSettingsController(
     ): PayuSettingsResponse {
         requireRole(propertyAccess, propertyId, principal, Role.ADMIN, Role.MANAGER)
         val settings = payuSettingsRepo.findByPropertyId(propertyId)
-            ?: throw ResponseStatusException(HttpStatus.NOT_FOUND, "PayU settings not configured")
+        if (settings == null) {
+            return PayuSettingsResponse(
+                propertyId = propertyId,
+                configured = false,
+                merchantKey = null,
+                isTest = false,
+                useSalt256 = true,
+                hasSalt32 = false,
+                hasSalt256 = false
+            )
+        }
         return settings.toResponse()
     }
 
@@ -88,6 +98,7 @@ private fun PayuSettings.toResponse(): PayuSettingsResponse {
     val propertyId = property.id ?: throw ResponseStatusException(HttpStatus.INTERNAL_SERVER_ERROR, "Property id missing")
     return PayuSettingsResponse(
         propertyId = propertyId,
+        configured = true,
         merchantKey = merchantKey,
         isTest = isTest,
         useSalt256 = useSalt256,

src/main/kotlin/com/android/trisolarisserver/controller/dto/PayuDtos.kt

@@ -12,7 +12,8 @@ data class PayuSettingsUpsertRequest(
 
 data class PayuSettingsResponse(
     val propertyId: UUID,
-    val merchantKey: String,
+    val configured: Boolean,
+    val merchantKey: String?,
     val isTest: Boolean,
     val useSalt256: Boolean,
     val hasSalt32: Boolean,