diff --git a/base.go b/base.go
index 5be13af..f9d88d6 100644
--- a/base.go
+++ b/base.go
@@ -11,7 +11,8 @@ import (
 )
 
 const (
-	baseUrl = "https://adwords.google.com/api/adwords/cm/v201409"
+	baseUrl = "https://adwords.google.com/api/adwords/cm/v201809"
+	mcmUrl  = "https://adwords.google.com/api/adwords/mcm/v201809"
 )
 
 type ServiceUrl struct {
@@ -56,7 +57,7 @@ var (
 	geoLocationServiceUrl           = ServiceUrl{baseUrl, "GeoLocationService"}
 	labelServiceUrl                 = ServiceUrl{baseUrl, "LabelService"}
 	locationCriterionServiceUrl     = ServiceUrl{baseUrl, "LocationCriterionService"}
-	managedCustomerServiceUrl       = ServiceUrl{baseUrl, "ManagedCustomerService"}
+	managedCustomerServiceUrl       = ServiceUrl{mcmUrl, "ManagedCustomerService"}
 	mediaServiceUrl                 = ServiceUrl{baseUrl, "MediaService"}
 	mutateJobServiceUrl             = ServiceUrl{baseUrl, "Mutate_JOB_Service"}
 	offlineConversionFeedServiceUrl = ServiceUrl{baseUrl, "OfflineConversionFeedService"}
diff --git a/base_test.go b/base_test.go
index 298df9c..df898bf 100644
--- a/base_test.go
+++ b/base_test.go
@@ -26,7 +26,7 @@ func rand_word(str_size int) string {
 	return string(bytes)
 }
 
-func testAuthSetup(t *testing.T) Auth {
+func testAuthSetup(t *testing.T) *Auth {
 	config, err := NewCredentials(context.TODO())
 	if err != nil {
 		t.Fatal(err)
diff --git a/conversion_tracker.go b/conversion_tracker.go
index 052297a..b2b5e59 100644
--- a/conversion_tracker.go
+++ b/conversion_tracker.go
@@ -1,5 +1,9 @@
 package gads
 
+import (
+	"encoding/xml"
+)
+
 type ConversionTrackerService struct {
 	Auth
 }
@@ -7,3 +11,44 @@ type ConversionTrackerService struct {
 func NewConversionTrackerService(auth *Auth) *ConversionTrackerService {
 	return &ConversionTrackerService{Auth: *auth}
 }
+
+type ConversionTracker struct {
+	Id                       int64  `xml:"id"`
+	OriginalConversionTypeId int64  `xml:"originalConversionTypeId"`
+	Name                     string `xml:"name"`
+	Status                   string `xml:"status"`
+	Category                 string `xml:"category"`
+	GoogleEventSnippet       string `xml:"googleEventSnippet"`
+	GoogleGlobalSiteTag      string `xml:"googleGlobalSiteTag"`
+}
+
+func (c *ConversionTrackerService) Get(selector Selector) (conversions []ConversionTracker, totalCount int64, err error) {
+	selector.XMLName = xml.Name{"", "serviceSelector"}
+	respBody, err := c.Auth.request(
+		conversionTrackerServiceUrl,
+		"get",
+		struct {
+			XMLName xml.Name
+			Sel     Selector
+		}{
+			XMLName: xml.Name{
+				Space: baseUrl,
+				Local: "get",
+			},
+			Sel: selector,
+		},
+	)
+	if err != nil {
+		return conversions, totalCount, err
+	}
+	getResp := struct {
+		Size        int64               `xml:"rval>totalNumEntries"`
+		Conversions []ConversionTracker `xml:"rval>entries"`
+	}{}
+
+	err = xml.Unmarshal([]byte(respBody), &getResp)
+	if err != nil {
+		return conversions, totalCount, err
+	}
+	return getResp.Conversions, getResp.Size, err
+}
diff --git a/managed_customer.go b/managed_customer.go
index c6de762..aa3f98f 100644
--- a/managed_customer.go
+++ b/managed_customer.go
@@ -1,5 +1,9 @@
 package gads
 
+import (
+	"encoding/xml"
+)
+
 type ManagedCustomerService struct {
 	Auth
 }
@@ -7,3 +11,49 @@ type ManagedCustomerService struct {
 func NewManagedCustomerService(auth *Auth) *ManagedCustomerService {
 	return &ManagedCustomerService{Auth: *auth}
 }
+
+type AccountLabel struct {
+	Id   string `xml:"id"`
+	Name string `xml:"name"`
+}
+
+type Account struct {
+	Name                  string         `xml:"name,omitempty"`
+	CanManageClients      bool           `xml:"canManageClients,omitempty"`
+	ExcludeHiddenAccounts bool           `xml:"excludeHiddenAccounts,omitempty"`
+	CustomerId            string         `xml:"customerId,omitempty"`
+	DateTimeZone          string         `xml:"dateTimeZone,omitempty"`
+	CurrencyCode          string         `xml:"currencyCode,omitempty"`
+	AccountLabels         []AccountLabel `xml:"accountLabels,omitempty"`
+}
+
+func (m *ManagedCustomerService) Get(selector Selector) (accounts []Account, totalCount int64, err error) {
+	selector.XMLName = xml.Name{"", "serviceSelector"}
+	respBody, err := m.Auth.request(
+		managedCustomerServiceUrl,
+		"get",
+		struct {
+			XMLName xml.Name
+			Sel     Selector
+		}{
+			XMLName: xml.Name{
+				Space: mcmUrl,
+				Local: "get",
+			},
+			Sel: selector,
+		},
+	)
+	if err != nil {
+		return accounts, totalCount, err
+	}
+	getResp := struct {
+		Size     int64     `xml:"rval>totalNumEntries"`
+		Accounts []Account `xml:"rval>entries"`
+	}{}
+
+	err = xml.Unmarshal([]byte(respBody), &getResp)
+	if err != nil {
+		return accounts, totalCount, err
+	}
+	return getResp.Accounts, getResp.Size, err
+}
diff --git a/oauth2.go b/oauth2.go
index 63d2775..25b1750 100644
--- a/oauth2.go
+++ b/oauth2.go
@@ -13,7 +13,7 @@ type AuthConfig struct {
 	OAuth2Config *oauth2.Config     `json:"oauth2.Config"`
 	OAuth2Token  *oauth2.Token      `json:"oauth2.Token"`
 	tokenSource  oauth2.TokenSource `json:"-"`
-	Auth         Auth               `json:"gads.Auth"`
+	Auth         *Auth              `json:"gads.Auth"`
 }
 
 func NewCredentialsFromFile(pathToFile string, ctx context.Context) (ac AuthConfig, err error) {
diff --git a/offline_conversion_feed.go b/offline_conversion_feed.go
index bd932c3..01af9a6 100644
--- a/offline_conversion_feed.go
+++ b/offline_conversion_feed.go
@@ -1,9 +1,67 @@
 package gads
 
+import "encoding/xml"
+
 type OfflineConversionService struct {
 	Auth
 }
 
+const (
+	uploadConversionAction = "ADD"
+)
+
+type OfflineConversionFeed struct {
+	GoogleClickId             string  `xml:"googleClickId"`
+	ConversionName            string  `xml:"conversionName"`
+	ConversionTime            string  `xml:"conversionTime"`
+	ConversionCurrencyCode    string  `xml:"conversionCurrencyCode"`
+	ExternalAttributionModel  string  `xml:"externalAttributionModel"`
+	ConversionValue           float32 `xml:"conversionValue"`
+	ExternalAttributionCredit float32 `xml:"externalAttributionCredit"`
+}
+
+type OfflineConversionOperations map[string][]OfflineConversionFeed
+
 func NewOfflineConversionService(auth *Auth) *OfflineConversionService {
 	return &OfflineConversionService{Auth: *auth}
 }
+
+func (o *OfflineConversionService) Mutate(conversionOperations OfflineConversionOperations) (conversion []OfflineConversionFeed, error error) {
+	type conversionOperation struct {
+		Action     string                `xml:"operator"`
+		Conversion OfflineConversionFeed `xml:"operand"`
+	}
+	var ops []conversionOperation
+
+	for _, conversion := range conversionOperations {
+		for _, con := range conversion {
+			ops = append(ops,
+				conversionOperation{
+					Action:     uploadConversionAction,
+					Conversion: con,
+				},
+			)
+		}
+	}
+	mutation := struct {
+		XMLName xml.Name
+		Ops     []conversionOperation `xml:"operations"`
+	}{
+		XMLName: xml.Name{
+			Space: baseUrl,
+			Local: "mutate",
+		},
+		Ops: ops}
+	respBody, err := o.Auth.request(offlineConversionFeedServiceUrl, "mutate", mutation)
+	if err != nil {
+		return conversion, err
+	}
+	mutateResp := struct {
+		Conversions []OfflineConversionFeed `xml:"rval>value"`
+	}{}
+	err = xml.Unmarshal([]byte(respBody), &mutateResp)
+	if err != nil {
+		return conversion, err
+	}
+	return mutateResp.Conversions, nil
+}