diff --git a/auth-server/logic/storage.go b/auth-server/logic/storage.go
index 287c455..44280a1 100644
--- a/auth-server/logic/storage.go
+++ b/auth-server/logic/storage.go
@@ -3,6 +3,7 @@ package logic
 import (
 	"context"
 	"fmt"
+
 	"github.com/go-oauth2/oauth2/v4"
 	"github.com/nspcc-dev/neo-go/pkg/util"
 )
@@ -13,7 +14,7 @@ type InMemoryClient struct {
 	IsPublic bool
 }
 
-var clients map[string]InMemoryClient
+var clients map[string]InMemoryClient = make(map[string]InMemoryClient)
 
 func AddInMemoryClient(id, userId, domain string, isPublic bool) error {
 	result := InMemoryClient{
diff --git a/auth-server/server.go b/auth-server/server.go
index 496926c..a074f6a 100644
--- a/auth-server/server.go
+++ b/auth-server/server.go
@@ -3,15 +3,17 @@ package main
 import (
 	"auth-server/logic"
 	"context"
+	"strconv"
+
 	"github.com/go-oauth2/oauth2/v4/errors"
 	"github.com/go-oauth2/oauth2/v4/manage"
 	"github.com/go-oauth2/oauth2/v4/server"
 	"github.com/go-oauth2/oauth2/v4/store"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/nspcc-dev/neo-go/pkg/rpcclient"
 	"github.com/nspcc-dev/neo-go/pkg/rpcclient/actor"
 	"github.com/nspcc-dev/neo-go/pkg/util"
 	"github.com/nspcc-dev/neo-go/pkg/wallet"
-	"strconv"
 
 	"log"
 	"log/slog"
@@ -34,13 +36,19 @@ func main() {
 
 	// contract integration
 	fileWallet, _ := wallet.NewWalletFromFile(config.WalletFile)
+	acc := fileWallet.Accounts[0]
+	// FIXME: account password should be in the config
+	if err := acc.Decrypt("one", keys.NEP2ScryptParams()); err != nil {
+		log.Fatal("Wallet decryption failed")
+	}
 	defer fileWallet.Close()
 
+	// FIXME: endpoint url should be in the config
 	rpcClient, _ := rpcclient.New(context.Background(), "url", rpcclient.Options{})
 	rpcActor, _ := actor.NewSimple(rpcClient, fileWallet.Accounts[0])
 
 	// smart contract check sum
-	var contractHash util.Uint160
+	var contractHash, _ = util.Uint160DecodeStringLE(config.ContractCheckSum)
 
 	// using blockchain storage
 	blockchainStorage := logic.NewBlockchainStorage(rpcActor, contractHash)
@@ -65,8 +73,8 @@ func main() {
 	})
 
 	http.HandleFunc("/login", func(w http.ResponseWriter, r *http.Request) {
-		id := r.Header.Get("client_id")
-		secret := r.Header.Get("client_secret")
+		id := r.URL.Query().Get("client_id")
+		secret := r.URL.Query().Get("client_secret")
 
 		_, err := blockchainStorage.CheckPassword(id, logic.HashSecret(secret))
 		if err != nil {