Use django helper to import variants

payments/core.py

@@ -1,7 +1,6 @@
 from __future__ import annotations
 
 import re
-from importlib import import_module
 from typing import TYPE_CHECKING
 from urllib.parse import urlencode
 from urllib.parse import urljoin
@@ -167,9 +166,7 @@ def _default_provider_factory(variant: str, payment: BasePayment | None = None):
     if not handler:
         raise ValueError(f"Payment variant does not exist: {variant}")
     if variant not in PROVIDER_CACHE:
-        module_path, class_name = handler.rsplit(".", 1)
-        module = import_module(module_path)
-        class_ = getattr(module, class_name)
+        class_ = import_string(handler)
         PROVIDER_CACHE[variant] = class_(**config)
     return PROVIDER_CACHE[variant]