Add isDM flag to Client and update FiscalRequest structure for DM support

api/client.go

@@ -9,6 +9,7 @@ import (
 type Client struct {
 	token          string
 	device         string
+	isDM           bool
 	resty          *resty.Client
 	apiBaseURL     string
 	fiscalEndpoint string
@@ -17,6 +18,7 @@ type Client struct {
 func NewClient(token string) *Client {
 	return &Client{
 		token:          token,
+		isDM:           false,
 		resty:          resty.New(),
 		apiBaseURL:     "https://kasa.vchasno.ua/api/v3",
 		fiscalEndpoint: "/fiscal/execute",
@@ -38,6 +40,7 @@ func NewDMClient(token, dmURL, device string) *Client {
 	return &Client{
 		token:          token,
 		device:         device,
+		isDM:           true,
 		resty:          restyClient,
 		apiBaseURL:     dmURL,
 		fiscalEndpoint: "/dm/execute",