Accept legacy settings payload for Razorpay

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

@@ -59,19 +59,29 @@ class RazorpaySettingsController(
         val property = propertyRepo.findById(propertyId).orElseThrow {
             ResponseStatusException(HttpStatus.NOT_FOUND, "Property not found")
         }
+        val keyId = request.keyId?.trim()?.ifBlank { null } ?: request.merchantKey?.trim()?.ifBlank { null }
+        val keySecret = request.keySecret?.trim()?.ifBlank { null }
+            ?: run {
+                val prefer256 = request.useSalt256 == true
+                val candidate = if (prefer256) request.salt256 else request.salt32
+                candidate?.trim()?.ifBlank { null } ?: request.salt256?.trim()?.ifBlank { null } ?: request.salt32?.trim()?.ifBlank { null }
+            }
+        if (keyId == null || keySecret == null) {
+            throw ResponseStatusException(HttpStatus.BAD_REQUEST, "keyId/keySecret required")
+        }
         val existing = settingsRepo.findByPropertyId(propertyId)
         val updated = if (existing == null) {
             RazorpaySettings(
                 property = property,
-                keyId = request.keyId.trim(),
+                keyId = keyId,
-                keySecret = request.keySecret.trim(),
+                keySecret = keySecret,
                 webhookSecret = request.webhookSecret?.trim(),
                 isTest = request.isTest ?: false,
                 updatedAt = OffsetDateTime.now()
             )
         } else {
-            existing.keyId = request.keyId.trim()
+            existing.keyId = keyId
-            existing.keySecret = request.keySecret.trim()
+            existing.keySecret = keySecret
             existing.webhookSecret = request.webhookSecret?.trim()
             request.isTest?.let { existing.isTest = it }
             existing.updatedAt = OffsetDateTime.now()

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

@@ -3,10 +3,15 @@ package com.android.trisolarisserver.controller.dto
 import java.util.UUID
 
 data class RazorpaySettingsUpsertRequest(
-    val keyId: String,
+    val keyId: String? = null,
-    val keySecret: String,
+    val keySecret: String? = null,
     val webhookSecret: String? = null,
-    val isTest: Boolean? = null
+    val isTest: Boolean? = null,
+    // Backward-compatible aliases (older clients sending PayU-shaped payloads)
+    val merchantKey: String? = null,
+    val salt32: String? = null,
+    val salt256: String? = null,
+    val useSalt256: Boolean? = null
 )
 
 data class RazorpaySettingsResponse(