diff --git a/certs_manager.cpp b/certs_manager.cpp
index 7170605..b55363f 100644
--- a/certs_manager.cpp
+++ b/certs_manager.cpp
@@ -8,10 +8,8 @@
 namespace certs
 {
 
-using namespace sdbusplus::xyz::openbmc_project::Common::Error;
-using InvalidCertificate =
-    sdbusplus::xyz::openbmc_project::Certs::Install::Error::InvalidCertificate;
-using Reason = xyz::openbmc_project::Certs::Install::InvalidCertificate::REASON;
+using InternalFailure =
+    sdbusplus::xyz::openbmc_project::Common::Error::InternalFailure;
 
 /** @brief Constructor to put object onto bus at a dbus path.
  *  @param[in] bus - Bus to attach to.
@@ -27,6 +25,10 @@
     bus(bus), objectPath(path), certType(type), unitToRestart(std::move(unit)),
     certInstallPath(std::move(installPath))
 {
+    using InvalidCertificate = sdbusplus::xyz::openbmc_project::Certs::Install::
+        Error::InvalidCertificate;
+    using Reason =
+        xyz::openbmc_project::Certs::Install::InvalidCertificate::REASON;
     if (fs::exists(certInstallPath))
     {
         try
@@ -41,12 +43,10 @@
         }
         catch (const InternalFailure& e)
         {
-            certificatePtr.reset(nullptr);
             report<InternalFailure>();
         }
         catch (const InvalidCertificate& e)
         {
-            certificatePtr.reset(nullptr);
             report<InvalidCertificate>(
                 Reason("Existing certificate file is corrupted"));
         }
@@ -55,6 +55,20 @@
 
 void Manager::install(const std::string filePath)
 {
+    using NotAllowed =
+        sdbusplus::xyz::openbmc_project::Common::Error::NotAllowed;
+    using Reason = xyz::openbmc_project::Common::NotAllowed::REASON;
+    // TODO: Issue#3 At present supporting only one certificate to be
+    // uploaded this need to be revisited to support multiple
+    // certificates
+    if (certificatePtr != nullptr)
+    {
+        elog<NotAllowed>(Reason("Certificate already exist"));
+    }
+    auto certObjectPath = objectPath + '/' + '1';
+    certificatePtr =
+        std::make_unique<Certificate>(bus, certObjectPath, certType,
+                                      unitToRestart, certInstallPath, filePath);
 }
 
 void Manager::delete_()