diff --git a/java/com/google/domain/registry/module/frontend/FrontendRequestComponent.java b/java/com/google/domain/registry/module/frontend/FrontendRequestComponent.java
index c0ca470bf..26168b5de 100644
--- a/java/com/google/domain/registry/module/frontend/FrontendRequestComponent.java
+++ b/java/com/google/domain/registry/module/frontend/FrontendRequestComponent.java
@@ -28,6 +28,7 @@ import com.google.domain.registry.request.RequestModule;
 import com.google.domain.registry.request.RequestScope;
 import com.google.domain.registry.ui.server.registrar.RegistrarPaymentAction;
 import com.google.domain.registry.ui.server.registrar.RegistrarPaymentSetupAction;
+import com.google.domain.registry.ui.server.registrar.RegistrarUserModule;
 import com.google.domain.registry.whois.WhoisHttpServer;
 import com.google.domain.registry.whois.WhoisModule;
 import com.google.domain.registry.whois.WhoisServer;
@@ -39,6 +40,7 @@ import dagger.Subcomponent;
 @Subcomponent(
     modules = {
         RdapModule.class,
+        RegistrarUserModule.class,
         RequestModule.class,
         WhoisModule.class,
     })
diff --git a/java/com/google/domain/registry/ui/server/registrar/RegistrarPaymentAction.java b/java/com/google/domain/registry/ui/server/registrar/RegistrarPaymentAction.java
index 06433f19c..61b20a631 100644
--- a/java/com/google/domain/registry/ui/server/registrar/RegistrarPaymentAction.java
+++ b/java/com/google/domain/registry/ui/server/registrar/RegistrarPaymentAction.java
@@ -24,6 +24,7 @@ import static java.util.Arrays.asList;
 import com.google.common.base.Function;
 import com.google.common.collect.ImmutableMap;
 import com.google.domain.registry.config.ConfigModule.Config;
+import com.google.domain.registry.model.registrar.Registrar;
 import com.google.domain.registry.request.Action;
 import com.google.domain.registry.request.JsonActionRunner;
 import com.google.domain.registry.request.JsonActionRunner.JsonAction;
@@ -145,6 +146,7 @@ public final class RegistrarPaymentAction implements Runnable, JsonAction {
 
   @Inject BraintreeGateway braintreeGateway;
   @Inject JsonActionRunner jsonActionRunner;
+  @Inject Registrar registrar;
   @Inject @Config("braintreeMerchantAccountIds") ImmutableMap<CurrencyUnit, String> accountIds;
   @Inject RegistrarPaymentAction() {}
 
@@ -183,6 +185,7 @@ public final class RegistrarPaymentAction implements Runnable, JsonAction {
                 .amount(amount.getAmount())
                 .paymentMethodNonce(paymentMethodNonce)
                 .merchantAccountId(merchantAccountId)
+                .customerId(registrar.getClientIdentifier())
                 .options()
                     .submitForSettlement(true)
                     .done());
diff --git a/java/com/google/domain/registry/ui/server/registrar/RegistrarUserModule.java b/java/com/google/domain/registry/ui/server/registrar/RegistrarUserModule.java
new file mode 100644
index 000000000..32bbf236c
--- /dev/null
+++ b/java/com/google/domain/registry/ui/server/registrar/RegistrarUserModule.java
@@ -0,0 +1,36 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.domain.registry.ui.server.registrar;
+
+import com.google.domain.registry.model.registrar.Registrar;
+import com.google.domain.registry.request.HttpException.ForbiddenException;
+
+import dagger.Module;
+import dagger.Provides;
+
+import javax.servlet.http.HttpServletRequest;
+
+/** Registrar Console module providing reference to logged-in {@link Registrar}. */
+@Module
+public final class RegistrarUserModule {
+
+  @Provides
+  static Registrar provideRegistrarUser(SessionUtils sessionUtils, HttpServletRequest req) {
+    if (!sessionUtils.checkRegistrarConsoleLogin(req)) {
+      throw new ForbiddenException("Not authorized to access Registrar Console");
+    }
+    return Registrar.loadByClientId(sessionUtils.getRegistrarClientId(req));
+  }
+}
diff --git a/java/com/google/domain/registry/ui/server/registrar/SessionUtils.java b/java/com/google/domain/registry/ui/server/registrar/SessionUtils.java
index 8d4db074b..6a228c93c 100644
--- a/java/com/google/domain/registry/ui/server/registrar/SessionUtils.java
+++ b/java/com/google/domain/registry/ui/server/registrar/SessionUtils.java
@@ -33,6 +33,7 @@ import com.google.domain.registry.util.FormattingLogger;
 import javax.annotation.CheckReturnValue;
 import javax.annotation.Nonnull;
 import javax.annotation.concurrent.Immutable;
+import javax.inject.Inject;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import javax.servlet.http.HttpSession;
@@ -47,6 +48,7 @@ public class SessionUtils {
 
   private final UserService userService;
 
+  @Inject
   public SessionUtils(UserService userService) {
     this.userService = checkNotNull(userService);
   }
diff --git a/javatests/com/google/domain/registry/ui/server/registrar/RegistrarPaymentActionTest.java b/javatests/com/google/domain/registry/ui/server/registrar/RegistrarPaymentActionTest.java
index b3c7bc513..0d59158cd 100644
--- a/javatests/com/google/domain/registry/ui/server/registrar/RegistrarPaymentActionTest.java
+++ b/javatests/com/google/domain/registry/ui/server/registrar/RegistrarPaymentActionTest.java
@@ -22,6 +22,8 @@ import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
 import com.google.common.collect.ImmutableMap;
+import com.google.domain.registry.model.registrar.Registrar;
+import com.google.domain.registry.testing.AppEngineRule;
 
 import com.braintreegateway.BraintreeGateway;
 import com.braintreegateway.Result;
@@ -35,6 +37,7 @@ import com.braintreegateway.ValidationErrors;
 
 import org.joda.money.CurrencyUnit;
 import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.ArgumentCaptor;
@@ -49,6 +52,9 @@ import java.math.BigDecimal;
 @RunWith(MockitoJUnitRunner.class)
 public class RegistrarPaymentActionTest {
 
+  @Rule
+  public final AppEngineRule appEngine = AppEngineRule.builder().withDatastore().build();
+
   @Mock
   private BraintreeGateway braintreeGateway;
 
@@ -71,6 +77,7 @@ public class RegistrarPaymentActionTest {
 
   @Before
   public void before() throws Exception {
+    paymentAction.registrar = Registrar.loadByClientId("TheRegistrar");
     paymentAction.accountIds =
         ImmutableMap.of(
             CurrencyUnit.USD, "merchant-account-usd",
@@ -106,6 +113,8 @@ public class RegistrarPaymentActionTest {
         .isEqualTo(BigDecimal.valueOf(123.4).setScale(2));
     assertThat(extractField(String.class, transactionRequest, "merchantAccountId"))
         .isEqualTo("merchant-account-usd");
+    assertThat(extractField(String.class, transactionRequest, "customerId"))
+        .isEqualTo("TheRegistrar");
   }
 
   @Test