Use isTest flag for PayU base URL

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

@@ -166,7 +166,7 @@ class PayuQrPayments(
             contentType = MediaType.APPLICATION_FORM_URLENCODED
         }
         val entity = org.springframework.http.HttpEntity(form, headers)
-        val response = restTemplate.postForEntity(settings.baseUrl, entity, String::class.java)
+        val response = restTemplate.postForEntity(resolveBaseUrl(settings), entity, String::class.java)
         val responseBody = response.body ?: ""
 
         record.responsePayload = responseBody
@@ -196,6 +196,14 @@ class PayuQrPayments(
         return "https://api.hoteltrisolaris.in/properties/$propertyId/payu/return/$path"
     }
 
+    private fun resolveBaseUrl(settings: com.android.trisolarisserver.models.payment.PayuSettings): String {
+        return if (settings.isTest) {
+            "https://test.payu.in/_payment"
+        } else {
+            "https://secure.payu.in/_payment"
+        }
+    }
+
     private fun sha512(input: String): String {
         val bytes = MessageDigest.getInstance("SHA-512").digest(input.toByteArray())
         return bytes.joinToString("") { "%02x".format(it) }