refactor: organize service dto contracts

internal/server/handler/payment_test.go

@@ -1,18 +1,18 @@
 package handler
 
 import (
+	"kra/internal/service/dto"
 	"net/http/httptest"
 	"testing"
 
 	"github.com/gin-gonic/gin"
-	"kra/internal/service"
 )
 
 func TestWritePaymentCallbackAckDoesNotExposeError(t *testing.T) {
 	gin.SetMode(gin.TestMode)
 	recorder := httptest.NewRecorder()
 	context, _ := gin.CreateTestContext(recorder)
-	writePaymentCallbackAck(context, service.PaymentCallbackAck{
+	writePaymentCallbackAck(context, dto.PaymentCallbackAck{
 		StatusCode:  500,
 		ContentType: "text/plain; charset=utf-8",
 		Body:        []byte("failure"),