diff --git a/request.go b/request.go
index d0616fe..4d49c23 100644
--- a/request.go
+++ b/request.go
@@ -1,5 +1,11 @@
 package retailcrm
 
+import (
+	"crypto/hmac"
+	"crypto/sha256"
+	"encoding/hex"
+)
+
 // CustomerRequest type.
 type CustomerRequest struct {
 	By   string `url:"by,omitempty"`
@@ -215,3 +221,35 @@ type CustomDictionariesRequest struct {
 	Limit  int                      `url:"limit,omitempty"`
 	Page   int                      `url:"page,omitempty"`
 }
+
+// ConnectRequest contains information about the system connection that is requested to be created.
+type ConnectRequest struct {
+	// Token is used to verify the request. Do not use directly; use Verify instead.
+	Token string `json:"token"`
+	// APIKey that was generated for the module.
+	APIKey string `json:"apiKey"`
+	// URL of the system. Do not use directly; use SystemURL instead.
+	URL string `json:"systemUrl"`
+}
+
+// SystemURL returns system URL from the connection request without trailing slash.
+func (r ConnectRequest) SystemURL() string {
+	if r.URL == "" {
+		return ""
+	}
+
+	if r.URL[len(r.URL)-1:] == "/" {
+		return r.URL[:len(r.URL)-1]
+	}
+
+	return r.URL
+}
+
+// Verify returns true if connection request is legitimate. Application secret should be provided to this method.
+func (r ConnectRequest) Verify(secret string) bool {
+	mac := hmac.New(sha256.New, []byte(secret))
+	if _, err := mac.Write([]byte(r.APIKey)); err != nil {
+		panic(err)
+	}
+	return hmac.Equal([]byte(r.Token), []byte(hex.EncodeToString(mac.Sum(nil))))
+}
diff --git a/request_test.go b/request_test.go
new file mode 100644
index 0000000..669e342
--- /dev/null
+++ b/request_test.go
@@ -0,0 +1,43 @@
+package retailcrm
+
+import (
+	"crypto/hmac"
+	"crypto/sha256"
+	"encoding/hex"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+)
+
+type ConnectRequestTest struct {
+	suite.Suite
+}
+
+func TestConnectRequest(t *testing.T) {
+	suite.Run(t, new(ConnectRequestTest))
+}
+
+func (t *ConnectRequestTest) Test_SystemURL() {
+	t.Assert().Equal("", ConnectRequest{}.SystemURL())
+	t.Assert().Equal("https://test.retailcrm.pro", ConnectRequest{URL: "https://test.retailcrm.pro"}.SystemURL())
+	t.Assert().Equal("https://test.retailcrm.pro", ConnectRequest{URL: "https://test.retailcrm.pro/"}.SystemURL())
+}
+
+func (t *ConnectRequestTest) Test_Verify() {
+	t.Assert().True(ConnectRequest{
+		APIKey: "key",
+		Token:  createConnectToken("key", "secret"),
+	}.Verify("secret"))
+	t.Assert().False(ConnectRequest{
+		APIKey: "key",
+		Token:  createConnectToken("key", "secret2"),
+	}.Verify("secret"))
+}
+
+func createConnectToken(apiKey, secret string) string {
+	mac := hmac.New(sha256.New, []byte(secret))
+	if _, err := mac.Write([]byte(apiKey)); err != nil {
+		panic(err)
+	}
+	return hex.EncodeToString(mac.Sum(nil))
+}
diff --git a/response.go b/response.go
index 5b753c9..a38d276 100644
--- a/response.go
+++ b/response.go
@@ -495,3 +495,30 @@ type UnitsResponse struct {
 	Success bool    `json:"success"`
 	Units   *[]Unit `json:"units,omitempty"`
 }
+
+// ErrorResponse should be returned to the one-step connection request in case of failure.
+type ErrorResponse struct {
+	SuccessfulResponse
+	ErrorMessage string `json:"errorMsg"`
+}
+
+// ConnectResponse should be returned to the one-step connection request in case of successful connection.
+type ConnectResponse struct {
+	SuccessfulResponse
+	AccountURL string `json:"accountUrl"`
+}
+
+// ConnectionConfigResponse contains connection configuration for one-step connection.
+type ConnectionConfigResponse struct {
+	SuccessfulResponse
+	Scopes      []string `json:"scopes"`
+	RegisterURL string   `json:"registerUrl"`
+}
+
+// NewConnectResponse returns ConnectResponse with the provided account URL.
+func NewConnectResponse(accountURL string) ConnectResponse {
+	return ConnectResponse{
+		SuccessfulResponse: SuccessfulResponse{Success: true},
+		AccountURL:         accountURL,
+	}
+}
diff --git a/response_test.go b/response_test.go
new file mode 100644
index 0000000..42bd7a2
--- /dev/null
+++ b/response_test.go
@@ -0,0 +1,16 @@
+package retailcrm
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNewConnectResponse(t *testing.T) {
+	assert.Equal(t, ConnectResponse{
+		SuccessfulResponse: SuccessfulResponse{
+			Success: true,
+		},
+		AccountURL: "https://example.com",
+	}, NewConnectResponse("https://example.com"))
+}