diff --git a/client/interface.go b/client/interface.go
new file mode 100644
index 0000000..0a76823
--- /dev/null
+++ b/client/interface.go
@@ -0,0 +1,41 @@
+package client
+
+import "github.com/partitio/gonextcloud/client/types"
+
+type BaseClient interface {
+	NewClient(hostname string) (*Client, error)
+
+	Login(username string, password string) error
+	Logout() error
+
+	User(name string) (*types.User, error)
+	UserSearch(search string) ([]string, error)
+	UserList() ([]string, error)
+	UserCreate(username string, password string) error
+	UserDelete(name string) error
+	UserDisable(name string) error
+	UserEnable(name string) error
+	UserGroupAdd(name string, group string) error
+	UserGroupDemote(name string, group string) error
+	UserGroupList(name string) ([]string, error)
+	UserGroupPromote(name string, group string) error
+	UserGroupRemove(name string, group string) error
+	UserGroupSubAdminList(name string) ([]string, error)
+	UserSendWelcomeEmail(name string) error
+
+	UserUpdateAddress(name string, address string) error
+	UserUpdateDisplayName(name string, displayName string) error
+	UserUpdateEmail(name string, email string) error
+	UserUpdatePassword(name string, password string) error
+	UserUpdatePhone(name string, phone string) error
+	UserUpdateQuota(name string, quota string) error
+	UserUpdateTwitter(name string, twitter string) error
+	UserUpdateWebSite(name string, website string) error
+
+	GroupSearch(search string) ([]string, error)
+	GroupList() ([]string, error)
+	GroupUsers(name string) ([]string, error)
+	GroupCreate(name string) error
+	GroupDelete(name string) error
+	GroupSubAdminList(name string) ([]string, error)
+}