Fix exception message not suscriptable

Author: Ahuahuachi

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "facturapi-python"
-version = "0.1.2"
+version = "0.1.3"
 authors = [{ name = "TI Sin Problemas", email = "pypi@tisinproblemas.com" }]
 description = "Unofficial Facturapi.io Python client"
 readme = "README.md"

src/facturapi/http.py

@@ -106,16 +106,18 @@ def _execute_request(
             raise FacturapiException(message) from error
 
         self.last_status = response.status_code
+        error_status_codes = [
+            self.STATUS_BAD_REQUEST,
+            self.STATUS_INTERNAL_SERVER_ERROR,
+        ]
 
-        if response.status_code == self.STATUS_BAD_REQUEST:
-            raise FacturapiException(response["message"])
+        if response.status_code in error_status_codes:
+            json_response = response.json()
+            raise FacturapiException(json_response["message"])
 
         if response.status_code == self.STATUS_NOT_AUTHENTICATED:
             raise FacturapiException("Wrong API KEY")
 
-        if response.status_code == self.STATUS_INTERNAL_SERVER_ERROR:
-            raise FacturapiException(response["message"])
-
         return response
 
     def _get_download_file_url(self, file_format: str, object_id: str):