diff --git a/pkg/provider/post_test.go b/pkg/provider/post_test.go
index 2f0dc8a..4cce5cc 100644
--- a/pkg/provider/post_test.go
+++ b/pkg/provider/post_test.go
@@ -251,7 +251,7 @@ func TestSSO_verifyPostSignature(t *testing.T) {
 		t.Run(tt.name, func(t *testing.T) {
 			spConfig := &serviceprovider.Config{Metadata: []byte(tt.args.spMetadata)}
 
-			sp, err := serviceprovider.NewServiceProvider("test", spConfig, "")
+			sp, err := serviceprovider.NewServiceProvider("test", spConfig, func(s string) string { return "" })
 			if err != nil {
 				t.Errorf("verifyPostSignature() got = %v, wanted to create service provider instance", err)
 				return
diff --git a/pkg/provider/redirect_test.go b/pkg/provider/redirect_test.go
index 87c689c..30f21b4 100644
--- a/pkg/provider/redirect_test.go
+++ b/pkg/provider/redirect_test.go
@@ -283,7 +283,7 @@ func TestRedirect_verifyRedirectSignature(t *testing.T) {
 		t.Run(tt.name, func(t *testing.T) {
 			spConfig := &serviceprovider.Config{Metadata: []byte(tt.args.spMetadata)}
 
-			sp, err := serviceprovider.NewServiceProvider("test", spConfig, "")
+			sp, err := serviceprovider.NewServiceProvider("test", spConfig, func(s string) string { return "" })
 			if err != nil {
 				t.Errorf("verifyRedirectSignature() got = %v, wanted to create service provider instance", err)
 				return
diff --git a/pkg/provider/serviceprovider/serviceprovider.go b/pkg/provider/serviceprovider/serviceprovider.go
index 83d9888..bd1697e 100644
--- a/pkg/provider/serviceprovider/serviceprovider.go
+++ b/pkg/provider/serviceprovider/serviceprovider.go
@@ -21,7 +21,7 @@ type ServiceProvider struct {
 	ID              string
 	Metadata        *md.EntityDescriptorType
 	signerPublicKey interface{}
-	defaultLoginURL string
+	loginURL        func(string) string
 }
 
 func (sp *ServiceProvider) GetEntityID() string {
@@ -29,10 +29,10 @@ func (sp *ServiceProvider) GetEntityID() string {
 }
 
 func (sp *ServiceProvider) LoginURL(id string) string {
-	return sp.defaultLoginURL + id
+	return sp.loginURL(id)
 }
 
-func NewServiceProvider(id string, config *Config, defaultLoginURL string) (*ServiceProvider, error) {
+func NewServiceProvider(id string, config *Config, loginURL func(string) string) (*ServiceProvider, error) {
 	metadata, err := xml.ParseMetadataXmlIntoStruct(config.Metadata)
 	if err != nil {
 		return nil, err
@@ -54,7 +54,7 @@ func NewServiceProvider(id string, config *Config, defaultLoginURL string) (*Ser
 		ID:              id,
 		Metadata:        metadata,
 		signerPublicKey: signerPublicKey,
-		defaultLoginURL: defaultLoginURL,
+		loginURL:        loginURL,
 	}, nil
 }
 
diff --git a/pkg/provider/sso_test.go b/pkg/provider/sso_test.go
index 2b3d599..8417857 100644
--- a/pkg/provider/sso_test.go
+++ b/pkg/provider/sso_test.go
@@ -628,7 +628,7 @@ func TestSSO_ssoHandleFunc(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			endpoint := NewEndpoint(tt.args.metadataEndpoint)
-			spInst, err := serviceprovider.NewServiceProvider(tt.args.sp.entityID, &serviceprovider.Config{Metadata: []byte(tt.args.sp.metadata)}, "")
+			spInst, err := serviceprovider.NewServiceProvider(tt.args.sp.entityID, &serviceprovider.Config{Metadata: []byte(tt.args.sp.metadata)}, func(s string) string { return "" })
 			if err != nil {
 				t.Errorf("error while creating service provider")
 				return