diff --git a/dll/dll/steam_billing.h b/dll/dll/steam_billing.h
new file mode 100644
index 00000000..619bfa2e
--- /dev/null
+++ b/dll/dll/steam_billing.h
@@ -0,0 +1,97 @@
+/* Copyright (C) 2019 Mr Goldberg
+   This file is part of the Goldberg Emulator
+
+   The Goldberg Emulator is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 3 of the License, or (at your option) any later version.
+
+   The Goldberg Emulator is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the Goldberg Emulator; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef __INCLUDED_STEAM_BILLING_H__
+#define __INCLUDED_STEAM_BILLING_H__
+
+#include "base.h"
+
+class Steam_Billing:
+public ISteamBilling
+{
+    class Settings *settings{};
+    class Networking *network{};
+    class SteamCallResults *callback_results{};
+    class SteamCallBacks *callbacks{};
+    class RunEveryRunCB *run_every_runcb{};
+    
+
+    static void steam_network_callback(void *object, Common_Message *msg);
+    static void steam_run_every_runcb(void *object);
+
+    void steam_run_callback();
+    void network_callback(Common_Message *msg);
+
+public:
+    Steam_Billing(class Settings *settings, class Networking *network, class SteamCallResults *callback_results, class SteamCallBacks *callbacks, class RunEveryRunCB *run_every_runcb);
+    ~Steam_Billing();
+
+    bool _unknown_fn_1( );
+    bool _unknown_fn_2( );
+    bool _unknown_fn_3( );
+    bool _unknown_fn_4( );
+    bool _unknown_fn_5( );
+    bool _unknown_fn_6( );
+    bool _unknown_fn_7( );
+    bool _unknown_fn_8( );
+    bool _unknown_fn_9( );
+    bool _unknown_fn_10( );
+    bool _unknown_fn_11( );
+    bool _unknown_fn_12( );
+    bool _unknown_fn_13( );
+    bool _unknown_fn_14( );
+    bool _unknown_fn_15( );
+    bool _unknown_fn_16( );
+    bool _unknown_fn_17( );
+    bool _unknown_fn_18( );
+    bool _unknown_fn_19( );
+
+    int _unknown_fn_20( );
+    int _unknown_fn_21( );
+    int _unknown_fn_22( );
+    int _unknown_fn_23( );
+    int _unknown_fn_24( );
+    int _unknown_fn_25( );
+    int _unknown_fn_26( );
+
+    const char* _unknown_fn_27( ); // returns null string (str address is inside .rdata so it can't change at runtime)
+
+    int _unknown_fn_28( );
+
+    int _unknown_fn_29( ); // mov eax, 2
+
+    int _unknown_fn_30( );
+    int _unknown_fn_31( );
+    int _unknown_fn_32( );
+    int _unknown_fn_33( );
+    int _unknown_fn_34( );
+    int _unknown_fn_35( );
+    int _unknown_fn_36( );
+    int _unknown_fn_37( );
+
+    const char* _unknown_fn_38( ); // returns null string (str address is inside .rdata so it can't change at runtime)
+
+    int _unknown_fn_39( );
+    int _unknown_fn_40( );
+
+    bool _unknown_fn_41( );
+    bool _unknown_fn_42( );
+    bool _unknown_fn_43( );
+
+};
+
+#endif // __INCLUDED_STEAM_BILLING_H__
diff --git a/dll/dll/steam_client.h b/dll/dll/steam_client.h
index 93f53584..480f85d0 100644
--- a/dll/dll/steam_client.h
+++ b/dll/dll/steam_client.h
@@ -51,6 +51,7 @@
 #include "steam_parties.h"
 #include "steam_remoteplay.h"
 #include "steam_tv.h"
+#include "steam_billing.h"
 
 #include "steam_gameserver.h"
 #include "steam_gameserverstats.h"
@@ -142,6 +143,7 @@ public:
     Steam_GameStats *steam_gamestats{};
     Steam_Timeline *steam_timeline{};
     Steam_App_Disable_Update *steam_app_disable_update{};
+    Steam_Billing *steam_billing{};
 
     Steam_GameServer *steam_gameserver{};
     Steam_Utils *steam_gameserver_utils{};
@@ -248,6 +250,8 @@ public:
 	// steam appp disable update
 	ISteamAppDisableUpdate *GetISteamAppDisableUpdate( HSteamUser hSteamUser, HSteamPipe hSteamPipe, const char *pchVersion );
 
+    // steam billing
+    ISteamBilling *GetISteamBilling( HSteamUser hSteamUser, HSteamPipe hSteamPipe, const char *pchVersion );
 
 	// Deprecated. Applications should use SteamAPI_RunCallbacks() or SteamGameServer_RunCallbacks() instead.
 	STEAM_PRIVATE_API( void RunFrame() );
diff --git a/dll/steam_billing.cpp b/dll/steam_billing.cpp
new file mode 100644
index 00000000..afc2b5b4
--- /dev/null
+++ b/dll/steam_billing.cpp
@@ -0,0 +1,427 @@
+/* Copyright (C) 2019 Mr Goldberg
+   This file is part of the Goldberg Emulator
+
+   The Goldberg Emulator is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 3 of the License, or (at your option) any later version.
+
+   The Goldberg Emulator is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the Goldberg Emulator; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+// this interface is not found in public SDK archives, it is based on reversing the returned vftable from steamclient64.dll
+// real client returns 0/false in all these functions, the TODO notes are just for the names
+
+
+#include "dll/steam_billing.h"
+
+
+void Steam_Billing::steam_run_every_runcb(void *object)
+{
+    // PRINT_DEBUG_ENTRY();
+
+    auto inst = (Steam_Billing *)object;
+    inst->steam_run_callback();
+}
+
+void Steam_Billing::steam_network_callback(void *object, Common_Message *msg)
+{
+    // PRINT_DEBUG_ENTRY();
+
+    auto inst = (Steam_Billing *)object;
+    inst->network_callback(msg);
+}
+
+
+
+Steam_Billing::Steam_Billing(class Settings *settings, class Networking *network, class SteamCallResults *callback_results, class SteamCallBacks *callbacks, class RunEveryRunCB *run_every_runcb)
+{
+    this->settings = settings;
+    this->network = network;
+    this->callback_results = callback_results;
+    this->callbacks = callbacks;
+    this->run_every_runcb = run_every_runcb;
+    
+    this->network->setCallback(CALLBACK_ID_USER_STATUS, settings->get_local_steam_id(), &Steam_Billing::steam_network_callback, this);
+    this->run_every_runcb->add(&Steam_Billing::steam_run_every_runcb, this);
+}
+
+Steam_Billing::~Steam_Billing()
+{
+    this->network->rmCallback(CALLBACK_ID_USER_STATUS, settings->get_local_steam_id(), &Steam_Billing::steam_network_callback, this);
+    this->run_every_runcb->remove(&Steam_Billing::steam_run_every_runcb, this);
+}
+
+
+bool Steam_Billing::_unknown_fn_1( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return false;
+}
+
+bool Steam_Billing::_unknown_fn_2( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return false;
+}
+
+bool Steam_Billing::_unknown_fn_3( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return false;
+}
+
+bool Steam_Billing::_unknown_fn_4( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return false;
+}
+
+bool Steam_Billing::_unknown_fn_5( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return false;
+}
+
+bool Steam_Billing::_unknown_fn_6( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return false;
+}
+
+bool Steam_Billing::_unknown_fn_7( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return false;
+}
+
+bool Steam_Billing::_unknown_fn_8( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return false;
+}
+
+bool Steam_Billing::_unknown_fn_9( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return false;
+}
+
+bool Steam_Billing::_unknown_fn_10( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return false;
+}
+
+bool Steam_Billing::_unknown_fn_11( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return false;
+}
+
+bool Steam_Billing::_unknown_fn_12( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return false;
+}
+
+bool Steam_Billing::_unknown_fn_13( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return false;
+}
+
+bool Steam_Billing::_unknown_fn_14( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return false;
+}
+
+bool Steam_Billing::_unknown_fn_15( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return false;
+}
+
+bool Steam_Billing::_unknown_fn_16( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return false;
+}
+
+bool Steam_Billing::_unknown_fn_17( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return false;
+}
+
+bool Steam_Billing::_unknown_fn_18( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return false;
+}
+
+bool Steam_Billing::_unknown_fn_19( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return false;
+}
+
+int Steam_Billing::_unknown_fn_20( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return 0;
+}
+
+int Steam_Billing::_unknown_fn_21( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return 0;
+}
+
+int Steam_Billing::_unknown_fn_22( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return 0;
+}
+
+int Steam_Billing::_unknown_fn_23( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return 0;
+}
+
+int Steam_Billing::_unknown_fn_24( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return 0;
+}
+
+int Steam_Billing::_unknown_fn_25( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return 0;
+}
+
+int Steam_Billing::_unknown_fn_26( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return 0;
+}
+
+const char* Steam_Billing::_unknown_fn_27( ) // returns null string (str address is inside .rdata so it can't change at runtime)
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return "";
+}
+
+int Steam_Billing::_unknown_fn_28( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return 0;
+}
+
+int Steam_Billing::_unknown_fn_29( ) // mov eax, 2
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return 0;
+}
+
+int Steam_Billing::_unknown_fn_30( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return 0;
+}
+
+int Steam_Billing::_unknown_fn_31( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return 0;
+}
+
+int Steam_Billing::_unknown_fn_32( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return 0;
+}
+
+int Steam_Billing::_unknown_fn_33( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return 0;
+}
+
+int Steam_Billing::_unknown_fn_34( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return 0;
+}
+
+int Steam_Billing::_unknown_fn_35( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return 0;
+}
+
+int Steam_Billing::_unknown_fn_36( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return 0;
+}
+
+int Steam_Billing::_unknown_fn_37( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return 0;
+}
+
+const char* Steam_Billing::_unknown_fn_38( ) // returns null string (str address is inside .rdata so it can't change at runtime)
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return "";
+}
+
+int Steam_Billing::_unknown_fn_39( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return 0;
+}
+
+int Steam_Billing::_unknown_fn_40( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return 0;
+}
+
+bool Steam_Billing::_unknown_fn_41( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return false;
+}
+
+bool Steam_Billing::_unknown_fn_42( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return false;
+}
+
+bool Steam_Billing::_unknown_fn_43( )
+{
+    PRINT_DEBUG_TODO();
+    std::lock_guard lock(global_mutex);
+
+    return false;
+}
+
+
+
+void Steam_Billing::steam_run_callback()
+{
+
+}
+
+
+
+void Steam_Billing::network_callback(Common_Message *msg)
+{
+    if (msg->has_low_level()) {
+        if (msg->low_level().type() == Low_Level::CONNECT) {
+            
+        }
+
+        if (msg->low_level().type() == Low_Level::DISCONNECT) {
+
+        }
+    }
+}
diff --git a/dll/steam_client.cpp b/dll/steam_client.cpp
index fc336d45..d57cff81 100644
--- a/dll/steam_client.cpp
+++ b/dll/steam_client.cpp
@@ -125,6 +125,7 @@ Steam_Client::Steam_Client()
     steam_gamestats = new Steam_GameStats(settings_client, network, callback_results_client, callbacks_client, run_every_runcb);
     steam_timeline = new Steam_Timeline(settings_client, network, callback_results_client, callbacks_client, run_every_runcb);
     steam_app_disable_update = new Steam_App_Disable_Update(settings_client, network, callback_results_client, callbacks_client, run_every_runcb);
+    steam_billing = new Steam_Billing(settings_client, network, callback_results_client, callbacks_client, run_every_runcb);
 
     // server
     PRINT_DEBUG("init gameserver");
@@ -207,6 +208,7 @@ Steam_Client::~Steam_Client()
     DEL_INST(steam_gamestats);
     DEL_INST(steam_timeline);
     DEL_INST(steam_app_disable_update);
+    DEL_INST(steam_billing);
 
     DEL_INST(steam_utils);
     DEL_INST(steam_friends);
diff --git a/dll/steam_client_interface_getter.cpp b/dll/steam_client_interface_getter.cpp
index 897c1a9c..89f7fe00 100644
--- a/dll/steam_client_interface_getter.cpp
+++ b/dll/steam_client_interface_getter.cpp
@@ -18,6 +18,21 @@
 #include "dll/steam_client.h"
 
 
+// retrieves the ISteamBilling interface associated with the handle
+ISteamBilling *Steam_Client::GetISteamBilling( HSteamUser hSteamUser, HSteamPipe hSteamPipe, const char *pchVersion )
+{
+    PRINT_DEBUG("%s", pchVersion);
+    if (!steam_pipes.count(hSteamPipe) || !hSteamUser) return nullptr;
+
+    if (strcmp(pchVersion, "SteamBilling001") == 0) {
+        return nullptr; // real steamclient64.dll returns null
+    } else if (strcmp(pchVersion, STEAMBILLING_INTERFACE_VERSION) == 0) {
+        return reinterpret_cast<ISteamBilling *>(static_cast<ISteamBilling *>(steam_billing));
+    }
+
+    report_missing_impl_and_exit(pchVersion, EMU_FUNC_NAME);
+}
+
 // retrieves the ISteamAppDisableUpdate interface associated with the handle
 ISteamAppDisableUpdate *Steam_Client::GetISteamAppDisableUpdate( HSteamUser hSteamUser, HSteamPipe hSteamPipe, const char *pchVersion )
 {
@@ -466,6 +481,8 @@ void *Steam_Client::GetISteamGenericInterface( HSteamUser hSteamUser, HSteamPipe
         return GetISteamTimeline(hSteamUser, hSteamPipe, pchVersion);
     } else if (strstr(pchVersion, "SteamAppDisableUpdate") == pchVersion) {
         return GetISteamAppDisableUpdate(hSteamUser, hSteamPipe, pchVersion);
+    } else if (strstr(pchVersion, "SteamBilling") == pchVersion) {
+        return GetISteamBilling(hSteamUser, hSteamPipe, pchVersion);
     }
     
     PRINT_DEBUG("No interface: %s", pchVersion);
diff --git a/sdk/steam/isteambilling.h b/sdk/steam/isteambilling.h
new file mode 100644
index 00000000..2bf615e9
--- /dev/null
+++ b/sdk/steam/isteambilling.h
@@ -0,0 +1,65 @@
+
+#ifndef ISTEAMBILLING_H
+#define ISTEAMBILLING_H
+
+// this interface is not found in public SDK archives, it is based on reversing the returned vftable from steamclient64.dll
+
+class ISteamBilling
+{
+public:
+    virtual bool _unknown_fn_1( ) = 0;
+    virtual bool _unknown_fn_2( ) = 0;
+    virtual bool _unknown_fn_3( ) = 0;
+    virtual bool _unknown_fn_4( ) = 0;
+    virtual bool _unknown_fn_5( ) = 0;
+    virtual bool _unknown_fn_6( ) = 0;
+    virtual bool _unknown_fn_7( ) = 0;
+    virtual bool _unknown_fn_8( ) = 0;
+    virtual bool _unknown_fn_9( ) = 0;
+    virtual bool _unknown_fn_10( ) = 0;
+    virtual bool _unknown_fn_11( ) = 0;
+    virtual bool _unknown_fn_12( ) = 0;
+    virtual bool _unknown_fn_13( ) = 0;
+    virtual bool _unknown_fn_14( ) = 0;
+    virtual bool _unknown_fn_15( ) = 0;
+    virtual bool _unknown_fn_16( ) = 0;
+    virtual bool _unknown_fn_17( ) = 0;
+    virtual bool _unknown_fn_18( ) = 0;
+    virtual bool _unknown_fn_19( ) = 0;
+
+    virtual int _unknown_fn_20( ) = 0;
+    virtual int _unknown_fn_21( ) = 0;
+    virtual int _unknown_fn_22( ) = 0;
+    virtual int _unknown_fn_23( ) = 0;
+    virtual int _unknown_fn_24( ) = 0;
+    virtual int _unknown_fn_25( ) = 0;
+    virtual int _unknown_fn_26( ) = 0;
+
+    virtual const char* _unknown_fn_27( ) = 0; // returns null string (str address is inside .rdata so it can't change at runtime)
+
+    virtual int _unknown_fn_28( ) = 0;
+
+    virtual int _unknown_fn_29( ) = 0; // mov eax, 2
+
+    virtual int _unknown_fn_30( ) = 0;
+    virtual int _unknown_fn_31( ) = 0;
+    virtual int _unknown_fn_32( ) = 0;
+    virtual int _unknown_fn_33( ) = 0;
+    virtual int _unknown_fn_34( ) = 0;
+    virtual int _unknown_fn_35( ) = 0;
+    virtual int _unknown_fn_36( ) = 0;
+    virtual int _unknown_fn_37( ) = 0;
+
+    virtual const char* _unknown_fn_38( ) = 0; // returns null string (str address is inside .rdata so it can't change at runtime)
+
+    virtual int _unknown_fn_39( ) = 0;
+    virtual int _unknown_fn_40( ) = 0;
+
+    virtual bool _unknown_fn_41( ) = 0;
+    virtual bool _unknown_fn_42( ) = 0;
+    virtual bool _unknown_fn_43( ) = 0;
+};
+
+#define STEAMBILLING_INTERFACE_VERSION "SteamBilling002"
+
+#endif // ISTEAMBILLING_H
diff --git a/sdk/steam/steam_api.h b/sdk/steam/steam_api.h
index 42283499..b1ed0480 100644
--- a/sdk/steam/steam_api.h
+++ b/sdk/steam/steam_api.h
@@ -22,6 +22,7 @@
 
 // All of the interfaces
 #include "isteamappdisableupdate.h"
+#include "isteambilling.h"
 #include "isteamclient.h"
 #include "isteamclient007.h"
 #include "isteamclient008.h"