Added a function to revoke subscription

playstore/validator.go

@@ -92,7 +92,8 @@ func (c *Client) CancelSubscription(packageName string, subscriptionID string, t
 	return err
 }
 
-// RefundSubscription refunds a user's subscription purchase.
+// RefundSubscription refunds a user's subscription purchase, but the subscription remains valid
+// until its expiration time and it will continue to recur.
 func (c *Client) RefundSubscription(packageName string, subscriptionID string, token string) error {
 	service, err := androidpublisher.New(c.httpClient)
 	if err != nil {
@@ -104,3 +105,17 @@ func (c *Client) RefundSubscription(packageName string, subscriptionID string, t
 
 	return err
 }
+
+// RevokeSubscription refunds and immediately revokes a user's subscription purchase.
+// Access to the subscription will be terminated immediately and it will stop recurring.
+func (c *Client) RevokeSubscription(packageName string, subscriptionID string, token string) error {
+	service, err := androidpublisher.New(c.httpClient)
+	if err != nil {
+		return err
+	}
+
+	ps := androidpublisher.NewPurchasesSubscriptionsService(service)
+	err = ps.Revoke(packageName, subscriptionID, token).Do()
+
+	return err
+}

playstore/validator_test.go

@@ -148,3 +148,25 @@ func TestRefundSubscription(t *testing.T) {
 
 	// TODO Normal scenario
 }
+
+func TestRevokeSubscription(t *testing.T) {
+	// Exception scenario
+	client := Client{nil}
+	expected := errors.New("client is nil")
+	actual := client.RevokeSubscription("package", "productID", "purchaseToken")
+
+	if !reflect.DeepEqual(actual, expected) {
+		t.Errorf("got %v\nwant %v", actual, expected)
+	}
+
+	jsonKey, _ := json.Marshal(testJSON)
+	client, _ = New(jsonKey)
+	expectedStr := "Post https://www.googleapis.com/androidpublisher/v2/applications/package/purchases/subscriptions/productID/tokens/purchaseToken:revoke?alt=json: oauth2: cannot fetch token: 400 Bad Request\nResponse: {\n  \"error\" : \"invalid_grant\"\n}"
+	actual = client.RevokeSubscription("package", "productID", "purchaseToken")
+
+	if actual.Error() != expectedStr {
+		t.Errorf("got %v\nwant %v", actual, expectedStr)
+	}
+
+	// TODO Normal scenario
+}