Add Validator for Purchase Product token (GooglePlay)

playstore/validator.go

@@ -122,6 +122,23 @@ func (c *Client) VerifySubscription(
 	return result, err
 }
 
+// VerifyProduct Verifies product status
+func (c *Client) VerifyProduct(
+	packageName string,
+	productID string,
+	token string,
+) (*androidpublisher.ProductPurchase, error) {
+	service, err := androidpublisher.New(c.httpClient)
+	if err != nil {
+		return nil, err
+	}
+
+	ps := androidpublisher.NewPurchasesProductsService(service)
+	result, err := ps.Get(packageName, productID, token).Do()
+
+	return result, err
+}
+
 func dialTimeout(network, addr string) (net.Conn, error) {
 	return net.DialTimeout(network, addr, defaultTimeout)
 }

playstore/validator_test.go

@@ -105,3 +105,24 @@ func TestVerifySubscription(t *testing.T) {
 
 	// TODO Nomal scenario
 }
+
+func TestVerifyProduct(t *testing.T) {
+	Init()
+
+	// Exception scenario
+	token := &oauth.Token{
+		AccessToken:  "accessToken",
+		RefreshToken: "refreshToken",
+		Expiry:       time.Unix(1234567890, 0).UTC(),
+	}
+
+	client := New(token)
+	expected := "Get https://www.googleapis.com/androidpublisher/v2/applications/package/purchases/products/productID/tokens/purchaseToken?alt=json: OAuthError: updateToken: Unexpected HTTP status 400 Bad Request"
+	_, err := client.VerifyProduct("package", "productID", "purchaseToken")
+
+	if err.Error() != expected {
+		t.Errorf("got %v", err)
+	}
+
+	// TODO Nomal scenario
+}