diff --git a/go.mod b/go.mod
index e8da7a9..9bd2e63 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,12 @@ module git.bit5.ru/backend/oauth2
 
 go 1.18
 
-require github.com/pkg/errors v0.9.1
+require (
+	github.com/pkg/errors v0.9.1
+	go.uber.org/zap v1.23.0
+)
+
+require (
+	go.uber.org/atomic v1.7.0 // indirect
+	go.uber.org/multierr v1.6.0 // indirect
+)
diff --git a/go.sum b/go.sum
index 7c401c3..c66fb5d 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,19 @@
+github.com/benbjohnson/clock v1.1.0 h1:Q92kusRqC1XV2MjkWETPvjJVqKetz1OzxZB7mHJLju8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/stretchr/testify v1.8.0 h1:pSgiaMZlXftHpm5L7V1+rVB+AZJydKsMxsQBIJw4PKk=
+go.uber.org/atomic v1.7.0 h1:ADUqmZGgLDDfbSL9ZmPxKTybcoEYHgpYfELNoN+7hsw=
+go.uber.org/atomic v1.7.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
+go.uber.org/goleak v1.1.11 h1:wy28qYRKZgnJTxGxvye5/wgWr1EKjmUDGYox5mGlRlI=
+go.uber.org/multierr v1.6.0 h1:y6IPFStTAIT5Ytl7/XYmHvzXQ7S3g/IeZW9hyZ5thw4=
+go.uber.org/multierr v1.6.0/go.mod h1:cdWPpRnG4AhwMwsgIHip0KRBQjJy5kYEpYjJxpXp9iU=
+go.uber.org/zap v1.23.0 h1:OjGQ5KQDEUawVHxNwQgPpiypGHOxo2mNZsOqTak4fFY=
+go.uber.org/zap v1.23.0/go.mod h1:D+nX8jyLsMHMYrln8A0rJjFt/T/9/bGgIhAqxv5URuY=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
diff --git a/oauth2.go b/oauth2.go
index cece370..da0b5d5 100644
--- a/oauth2.go
+++ b/oauth2.go
@@ -10,6 +10,7 @@ import (
 	"sync"
 
 	"github.com/pkg/errors"
+	"go.uber.org/zap"
 )
 
 type Config struct {
@@ -54,13 +55,15 @@ type TokenRetriever struct {
 	tokenURL   string
 	httpClient *http.Client
 	timeNow    timeNowFunc
+	logger     *zap.SugaredLogger
 }
 
-func NewTokenRetriever(tokenURL string, httpClient *http.Client, timeNow timeNowFunc) *TokenRetriever {
+func NewTokenRetriever(tokenURL string, httpClient *http.Client, timeNow timeNowFunc, logger *zap.SugaredLogger) *TokenRetriever {
 	tr := TokenRetriever{
 		tokenURL:   tokenURL,
 		httpClient: httpClient,
 		timeNow:    timeNow,
+		logger:     logger,
 	}
 	return &tr
 }
@@ -77,6 +80,8 @@ func (tr *TokenRetriever) Retrieve(ctx context.Context, data url.Values) (Token,
 	}
 	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
 
+	tr.logger.Infof("retrieve token with request: %+v", req)
+
 	resp, err := tr.httpClient.Do(req)
 	if err != nil {
 		return Token{}, errors.WithStack(err)