Add Utm field to the Customer struct

v1/client_test.go

@@ -501,6 +501,10 @@ func (t *MGClientTest) Test_TextMessages() {
 			ExternalID: "6",
 			Nickname:   "octopus",
 			Firstname:  "Joe",
+			Utm: &Utm{
+				Source: "test-source",
+				Term:   "",
+			},
 		},
 		Channel:        1,
 		ExternalChatID: "24798237492374",

v1/types.go

@@ -256,6 +256,15 @@ type Customer struct {
 	Language   string `json:"language,omitempty"`
 	Phone      string `json:"phone,omitempty"`
 	Email      string `json:"email,omitempty"`
+	Utm        *Utm   `json:"utm,omitempty"`
+}
+
+type Utm struct {
+	Source   string `json:"source,omitempty"`
+	Medium   string `json:"medium,omitempty"`
+	Campaign string `json:"campaign,omitempty"`
+	Term     string `json:"term,omitempty"`
+	Content  string `json:"content,omitempty"`
 }
 
 // Message struct.