feat: add carrier metadata beta endpoint

Author: Justintime50

easypost/beta/__init__.py

@@ -1,3 +1,4 @@
 # flake8: noqa
+from easypost.beta.carrier_metadata import CarrierMetadata
 from easypost.beta.rate import Rate
 from easypost.beta.referral import Referral

easypost/beta/carrier_metadata.py

@@ -0,0 +1,26 @@
+from typing import (
+    Any,
+    List,
+    Optional,
+)
+
+from easypost.easypost_object import convert_to_easypost_object
+from easypost.requestor import (
+    RequestMethod,
+    Requestor,
+)
+
+
+class CarrierMetadata:
+    @classmethod
+    def retrieve_carrier_metadata(
+        cls, api_key: Optional[str] = None, carriers: Optional[List[str]] = None, types: Optional[List[str]] = None
+    ) -> List[dict[str, Any]]:
+        """Get carrier metadata for all carriers on the EasyPost platform."""
+        requestor = Requestor(local_api_key=api_key)
+        params = {
+            "carriers": ",".join(carriers) if carriers else None,
+            "types": ",".join(types) if types else None,
+        }
+        response, api_key = requestor.request(method=RequestMethod.GET, url="/metadata", params=params, beta=True)
+        return convert_to_easypost_object(response=response.get("carriers", []), api_key=api_key)