diff --git a/app/models/gg/EnrolRequest.scala b/app/models/gg/EnrolRequest.scala
new file mode 100644
index 00000000..cd8d19a1
--- /dev/null
+++ b/app/models/gg/EnrolRequest.scala
@@ -0,0 +1,29 @@
+/*
+ * Copyright 2017 HM Revenue & Customs
+ *
+ * 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 models.gg
+
+import play.api.libs.json.Json
+
+
+case class EnrolRequest(portalId: String,
+                   serviceName: String,
+                   friendlyName: String,
+                   knownFacts: List[String])
+
+object EnrolRequest {
+  implicit val format = Json.format[EnrolRequest]
+}
diff --git a/app/models/gg/EnrolResponse.scala b/app/models/gg/EnrolResponse.scala
new file mode 100644
index 00000000..335634f1
--- /dev/null
+++ b/app/models/gg/EnrolResponse.scala
@@ -0,0 +1,29 @@
+/*
+ * Copyright 2017 HM Revenue & Customs
+ *
+ * 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 models.gg
+
+import play.api.libs.json.Json
+
+
+case class EnrolResponse(serviceName: String,
+                         state: String,
+                         friendlyName: String,
+                         identifiers: List[TypeValuePair])
+
+object EnrolResponse {
+  implicit val format = Json.format[EnrolResponse]
+}
diff --git a/app/models/gg/KnownFactsRequest.scala b/app/models/gg/KnownFactsRequest.scala
new file mode 100644
index 00000000..6d62df77
--- /dev/null
+++ b/app/models/gg/KnownFactsRequest.scala
@@ -0,0 +1,26 @@
+/*
+ * Copyright 2017 HM Revenue & Customs
+ *
+ * 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 models.gg
+
+import play.api.libs.json.Json
+
+
+case class KnownFactsRequest(facts: List[TypeValuePair])
+
+object KnownFactsRequest {
+  implicit val formats = Json.format[KnownFactsRequest]
+}
diff --git a/app/models/gg/TypeValuePair.scala b/app/models/gg/TypeValuePair.scala
new file mode 100644
index 00000000..221bd79f
--- /dev/null
+++ b/app/models/gg/TypeValuePair.scala
@@ -0,0 +1,25 @@
+/*
+ * Copyright 2017 HM Revenue & Customs
+ *
+ * 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 models.gg
+
+import play.api.libs.json.Json
+
+case class TypeValuePair(`type`: String, value: String)
+
+object TypeValuePair {
+  implicit val format = Json.format[TypeValuePair]
+}
diff --git a/test/unit/models/gg/EnrolRequestSpec.scala b/test/unit/models/gg/EnrolRequestSpec.scala
new file mode 100644
index 00000000..a00f9c87
--- /dev/null
+++ b/test/unit/models/gg/EnrolRequestSpec.scala
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2017 HM Revenue & Customs
+ *
+ * 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 unit.models.gg
+
+import models.gg.EnrolRequest
+import play.api.libs.json.JsValue
+import uk.gov.hmrc.play.test.UnitSpec
+import utils.JsonUtils._
+import utils.TestConstants.GG.EnrolRequestExamples
+
+class EnrolRequestSpec extends UnitSpec {
+
+  import EnrolRequestExamples._
+
+  "EnrolRequest" should {
+    "Provide the correct writer for EnrolRequest" in {
+      val request: JsValue = EnrolRequest(
+        portalId,
+        serviceName,
+        friendlyName,
+        List(knownFact1, knownFact2)
+      )
+
+      val expected: JsValue = jsonEnrolRequest(
+        portalId,
+        serviceName,
+        friendlyName,
+        List(knownFact1, knownFact2)
+      )
+
+      request shouldBe expected
+    }
+  }
+
+}
diff --git a/test/unit/models/gg/EnrolResponseSpec.scala b/test/unit/models/gg/EnrolResponseSpec.scala
new file mode 100644
index 00000000..8b4553f8
--- /dev/null
+++ b/test/unit/models/gg/EnrolResponseSpec.scala
@@ -0,0 +1,55 @@
+/*
+ * Copyright 2017 HM Revenue & Customs
+ *
+ * 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 unit.models.gg
+
+import models.gg.{EnrolResponse, TypeValuePair}
+import play.api.libs.json.JsValue
+import uk.gov.hmrc.play.test.UnitSpec
+import utils.JsonUtils._
+import utils.TestConstants.GG.EnrolResponseExamples
+
+class EnrolResponseSpec extends UnitSpec {
+
+  import EnrolResponseExamples._
+
+  "EnrolResponse" should {
+    "Provide the correct reader for EnrolResponse" in {
+      val response: JsValue = EnrolResponse(
+        serviceName,
+        state,
+        friendlyName,
+        List(
+          TypeValuePair(testType1, testValue1),
+          TypeValuePair(testType2, testValue2)
+        )
+      )
+
+      val expected = jsonEnrolResponse(
+        serviceName,
+        state,
+        friendlyName,
+        List(
+          TypeValuePair(testType1, testValue1),
+          TypeValuePair(testType2, testValue2)
+        )
+      )
+
+      response shouldBe expected
+    }
+  }
+
+}
diff --git a/test/unit/models/gg/KnownFactsRequestSpec.scala b/test/unit/models/gg/KnownFactsRequestSpec.scala
new file mode 100644
index 00000000..e8ed0445
--- /dev/null
+++ b/test/unit/models/gg/KnownFactsRequestSpec.scala
@@ -0,0 +1,54 @@
+/*
+ * Copyright 2017 HM Revenue & Customs
+ *
+ * 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 unit.models.gg
+
+import models.gg.{KnownFactsRequest, TypeValuePair}
+import play.api.libs.json.{JsValue, Json}
+import uk.gov.hmrc.play.test.UnitSpec
+import utils.JsonUtils._
+import utils.TestConstants.GG.TypeValuePairExamples
+
+class KnownFactsRequestSpec extends UnitSpec {
+
+  import TypeValuePairExamples._
+
+  "KnownFactsRequest" should {
+    "Provide the correct writer for KnownFactsRequest" in {
+      val knownFact1 = TypeValuePair(
+        `type` = testType1,
+        value = testValue1
+      )
+      val knownFact2 = TypeValuePair(
+        `type` = testType2,
+        value = testValue2
+      )
+      val knownFactsRequest = KnownFactsRequest(List(knownFact1, knownFact2))
+
+      val request: JsValue = Json.toJson(knownFactsRequest)
+      val expected = Json.fromJson[KnownFactsRequest](
+        s"""{
+           | "facts": [
+           |        ${jsonTypeValuePair(testType1, testValue1).get},
+           |        ${jsonTypeValuePair(testType2, testValue2).get}]
+           | }""".stripMargin).get
+      val actual = Json.fromJson[KnownFactsRequest](request).get
+
+      actual shouldBe expected
+    }
+  }
+
+}
diff --git a/test/unit/models/gg/TypeValuePairSpec.scala b/test/unit/models/gg/TypeValuePairSpec.scala
new file mode 100644
index 00000000..648e319d
--- /dev/null
+++ b/test/unit/models/gg/TypeValuePairSpec.scala
@@ -0,0 +1,43 @@
+/*
+ * Copyright 2017 HM Revenue & Customs
+ *
+ * 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 unit.models.gg
+
+import models.gg.TypeValuePair
+import play.api.libs.json.{JsValue, Json}
+import uk.gov.hmrc.play.test.UnitSpec
+import utils.TestConstants.GG.TypeValuePairExamples
+
+class TypeValuePairSpec extends UnitSpec {
+
+  import TypeValuePairExamples._
+
+  "TypeValuePair" should {
+    "Provide the correct writer for TypeValuePair" in {
+      val knownFact = TypeValuePair(
+        `type` = testType1,
+        value = testValue1
+      )
+
+      val request: JsValue = Json.toJson(knownFact)
+      val expected = Json.fromJson[TypeValuePair](jsonTypeValuePair(testType1,testValue1)).get
+      val actual = Json.fromJson[TypeValuePair](request).get
+
+      actual shouldBe expected
+    }
+  }
+
+}
diff --git a/test/utils/TestConstants.scala b/test/utils/TestConstants.scala
index 9659fef1..e5752ade 100644
--- a/test/utils/TestConstants.scala
+++ b/test/utils/TestConstants.scala
@@ -16,14 +16,15 @@
 
 package utils
 
-import play.api.libs.json.JsValue
-import uk.gov.hmrc.domain.Generator
-import JsonUtils._
-import models.{DateModel, ErrorModel}
 import models.frontend.{Both, Business, FERequest, Property}
+import models.gg.TypeValuePair
 import models.registration.RegistrationRequestModel
 import models.subscription.business.{BusinessDetailsModel, BusinessSubscriptionRequestModel}
+import models.{DateModel, ErrorModel}
 import play.api.http.Status._
+import play.api.libs.json.JsValue
+import uk.gov.hmrc.domain.Generator
+import utils.JsonUtils._
 
 object TestConstants {
 
@@ -59,8 +60,8 @@ object TestConstants {
     nino = testNino,
     incomeSource = Business,
     isAgent = false,
-    accountingPeriodStart = DateModel("01","05","2017"),
-    accountingPeriodEnd = DateModel("30","04","2018"),
+    accountingPeriodStart = DateModel("01", "05", "2017"),
+    accountingPeriodEnd = DateModel("30", "04", "2018"),
     tradingName = "Test Business",
     cashOrAccruals = "cash"
   )
@@ -69,8 +70,8 @@ object TestConstants {
     nino = testNino,
     incomeSource = Both,
     isAgent = false,
-    accountingPeriodStart = DateModel("01","05","2017"),
-    accountingPeriodEnd = DateModel("30","04","2018"),
+    accountingPeriodStart = DateModel("01", "05", "2017"),
+    accountingPeriodEnd = DateModel("30", "04", "2018"),
     tradingName = "Test Business",
     cashOrAccruals = "cash"
   )
@@ -176,26 +177,26 @@ object TestConstants {
   object BusinessSubscriptionResponse {
     def successResponse(safeId: String, mtditId: String, sourceId: String): JsValue =
       s"""{
-       |  "safeId": "$safeId",
-       |  "mtditId": "$mtditId",
-       |  "incomeSources": [{
-       |    "incomeSourceId": "$sourceId"
-       |  }]
-       |}
+         |  "safeId": "$safeId",
+         |  "mtditId": "$mtditId",
+         |  "incomeSources": [{
+         |    "incomeSourceId": "$sourceId"
+         |  }]
+         |}
       """.stripMargin
   }
 
   object PropertySubscriptionResponse {
     def successResponse(safeId: String, mtditId: String, sourceId: String): JsValue =
       s"""
-        |{
-        | "safeId": "$safeId",
-        | "mtditId": "$mtditId",
-        | "incomeSource":
-        | {
-        |   "incomeSourceId": "$sourceId"
-        | }
-        |}
+         |{
+         | "safeId": "$safeId",
+         | "mtditId": "$mtditId",
+         | "incomeSource":
+         | {
+         |   "incomeSourceId": "$sourceId"
+         | }
+         |}
     """.stripMargin
   }
 
@@ -207,4 +208,59 @@ object TestConstants {
        |  "reason":"$reason"
        |}
     """.stripMargin
+
+  object GG {
+
+    object TypeValuePairExamples {
+      val testType1 = "MOSW2Number"
+      val testValue1 = "10"
+      val testType2 = "MOSW2ID"
+      val testValue2 = "A"
+
+      def jsonTypeValuePair(testType: String, testValue: String): JsValue =
+        s"""{"type" : "$testType",
+           | "value" : "$testValue"
+           | }""".stripMargin
+    }
+
+    object EnrolRequestExamples {
+      val portalId = "MOSW"
+      val serviceName = "MOSW5"
+      val friendlyName = "Main Enrolment"
+      val knownFact1 = "DV200L"
+      val knownFact2 = "13 66GH"
+
+      def jsonEnrolRequest(portalId: String, serviceName: String, friendlyName: String, knownFacts: List[String]): JsValue =
+        s"""{
+           |     "portalId": "$portalId",
+           |     "serviceName": "$serviceName",
+           |     "friendlyName": "$friendlyName",
+           |     "knownFacts": [
+           |        ${knownFacts.map(x =>s""" "$x" """).mkString(",")}
+           |      ]
+           |}""".stripMargin
+    }
+
+    object EnrolResponseExamples {
+      val serviceName = "MOSW5"
+      val state = "NotYetActivated"
+      val friendlyName = ""
+      val testType1 = "MOSW5PostCode"
+      val testValue1 = "13 9DF"
+      val testType2 = "MOSW5Reference"
+      val testValue2 = "DV200L"
+
+      def jsonEnrolResponse(serviceName: String, state: String, friendlyName: String, identifier: List[TypeValuePair]): JsValue =
+        s"""{
+           |     "serviceName": "$serviceName",
+           |     "state": "$state",
+           |     "friendlyName": "$friendlyName",
+           |     "identifiers": [
+           |        ${identifier.map(x => s"""{ "type" : "${x.`type`}", "value" : "${x.value}"}""").mkString(",")}
+           |      ]
+           |}""".stripMargin
+    }
+
+  }
+
 }