diff --git a/mati/types/enums.py b/mati/types/enums.py
index 0a17c00..879bcd9 100644
--- a/mati/types/enums.py
+++ b/mati/types/enums.py
@@ -13,6 +13,20 @@ class PageType(SerializableEnum):
     back = 'back'
 
 
+@dataclass
+class BaseModel:
+    @classmethod
+    def _filter_excess_fields(cls, obj_dict: Dict) -> None:
+        excess = set(obj_dict.keys()) - {f.name for f in fields(cls)}
+        for f in excess:
+            del obj_dict[f]
+
+    @classmethod
+    def _from_dict(cls, obj_dict: Dict[str, Any]) -> 'BaseModel':
+        cls._filter_excess_fields(obj_dict)
+        return cls(**obj_dict)
+
+
 class ValidationInputType(SerializableEnum):
     document_photo = 'document-photo'
     selfie_photo = 'selfie-photo'
@@ -28,25 +42,12 @@ class ValidationType(SerializableEnum):
 
 
 @dataclass
-class VerificationDocumentStep:
+class VerificationDocumentStep(BaseModel):
     id: str
     status: int
     error: Optional[Dict] = None
     data: Optional[Dict] = field(default_factory=dict)
 
-    @classmethod
-    def _filter_excess_fields(cls, obj_dict: Dict) -> None:
-        excess = set(obj_dict.keys()) - {f.name for f in fields(cls)}
-        for f in excess:
-            del obj_dict[f]
-
-    @classmethod
-    def _from_dict(
-        cls, obj_dict: Dict[str, Any]
-    ) -> 'VerificationDocumentStep':
-        cls._filter_excess_fields(obj_dict)
-        return cls(**obj_dict)
-
 
 @dataclass
 class Errors:
@@ -57,7 +58,7 @@ class Errors:
 
 
 @dataclass
-class VerificationDocument:
+class VerificationDocument(BaseModel):
     country: str
     region: str
     photos: List[str]
@@ -66,17 +67,6 @@ class VerificationDocument:
     subtype: Optional[str] = None
     fields: Optional[dict] = None
 
-    @classmethod
-    def _filter_excess_fields(cls, obj_dict: Dict) -> None:
-        excess = set(obj_dict.keys()) - {f.name for f in fields(cls)}
-        for f in excess:
-            del obj_dict[f]
-
-    @classmethod
-    def _from_dict(cls, obj_dict: Dict[str, Any]) -> 'VerificationDocument':
-        cls._filter_excess_fields(obj_dict)
-        return cls(**obj_dict)
-
     @property
     def errors(self) -> List[Errors]:
         if not self.steps:
@@ -200,23 +190,12 @@ class LivenessMedia:
 
 
 @dataclass
-class Liveness:
+class Liveness(BaseModel):
     status: int
     id: str
     data: Optional[LivenessMedia] = None
     error: Optional[Dict] = None
 
-    @classmethod
-    def _filter_excess_fields(cls, obj_dict: Dict) -> None:
-        excess = set(obj_dict.keys()) - {f.name for f in fields(cls)}
-        for f in excess:
-            del obj_dict[f]
-
-    @classmethod
-    def _from_dict(cls, obj_dict: Dict[str, Any]) -> 'Liveness':
-        cls._filter_excess_fields(obj_dict)
-        return cls(**obj_dict)
-
 
 @dataclass
 class DocumentScore:
diff --git a/mati/version.py b/mati/version.py
index dce5733..d30bdd0 100644
--- a/mati/version.py
+++ b/mati/version.py
@@ -1 +1 @@
-__version__ = '2.0.6.dev4'
+__version__ = '2.0.6.dev5'