Allow partial Razorpay settings updates

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

@@ -59,6 +59,7 @@ class RazorpaySettingsController(
         val property = propertyRepo.findById(propertyId).orElseThrow {
             ResponseStatusException(HttpStatus.NOT_FOUND, "Property not found")
         }
+        val existing = settingsRepo.findByPropertyId(propertyId)
         val keyId = request.keyId?.trim()?.ifBlank { null } ?: request.merchantKey?.trim()?.ifBlank { null }
         val keySecret = request.keySecret?.trim()?.ifBlank { null }
             ?: run {
@@ -66,24 +67,25 @@ class RazorpaySettingsController(
                 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) {
+        val webhookSecret = request.webhookSecret?.trim()?.ifBlank { null }
+        val isTest = request.isTest
+        if (existing == null && (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 = keyId,
+                keyId = keyId!!,
-                keySecret = keySecret,
+                keySecret = keySecret!!,
-                webhookSecret = request.webhookSecret?.trim(),
+                webhookSecret = webhookSecret,
-                isTest = request.isTest ?: false,
+                isTest = isTest ?: false,
                 updatedAt = OffsetDateTime.now()
             )
         } else {
-            existing.keyId = keyId
+            if (keyId != null) existing.keyId = keyId
-            existing.keySecret = keySecret
+            if (keySecret != null) existing.keySecret = keySecret
-            existing.webhookSecret = request.webhookSecret?.trim()
+            if (webhookSecret != null) existing.webhookSecret = webhookSecret
-            request.isTest?.let { existing.isTest = it }
+            isTest?.let { existing.isTest = it }
             existing.updatedAt = OffsetDateTime.now()
             existing
         }