diff --git a/README.md b/README.md
index 6b330f26..605cb23f 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ The full API of this library can be found in [api.md](https://www.github.com/Fin
 from finch import Finch
 
 client = Finch(
-    access_token="my access token",
+    access_token="My Access Token",
 )
 
 page = client.hris.directory.list(
@@ -42,7 +42,7 @@ Simply import `AsyncFinch` instead of `Finch` and use `await` with each API call
 from finch import AsyncFinch
 
 client = AsyncFinch(
-    access_token="my access token",
+    access_token="My Access Token",
 )
 
 
diff --git a/src/finch/_base_client.py b/src/finch/_base_client.py
index 1ef2efa0..e72ead11 100644
--- a/src/finch/_base_client.py
+++ b/src/finch/_base_client.py
@@ -811,7 +811,10 @@ def close(self) -> None:
 
         The client will *not* be usable after this.
         """
-        self._client.close()
+        # If an error is thrown while constructing a client, self._client
+        # may not be present
+        if hasattr(self, "_client"):
+            self._client.close()
 
     def __enter__(self: _T) -> _T:
         return self
diff --git a/src/finch/_client.py b/src/finch/_client.py
index 864333ee..80eaa1b4 100644
--- a/src/finch/_client.py
+++ b/src/finch/_client.py
@@ -62,11 +62,11 @@ class Finch(SyncAPIClient):
     def __init__(
         self,
         *,
-        client_id: str | None = None,
-        client_secret: str | None = None,
-        webhook_secret: str | None = None,
+        access_token: str | None = None,
+        client_id: str | None = os.environ.get("FINCH_CLIENT_ID", None),
+        client_secret: str | None = os.environ.get("FINCH_CLIENT_SECRET", None),
+        webhook_secret: str | None = os.environ.get("FINCH_WEBHOOK_SECRET", None),
         base_url: Optional[str] = None,
-        access_token: Optional[str] = None,
         timeout: Union[float, Timeout, None, NotGiven] = NOT_GIVEN,
         max_retries: int = DEFAULT_MAX_RETRIES,
         default_headers: Mapping[str, str] | None = None,
@@ -98,14 +98,11 @@ def __init__(
         """
         self.access_token = access_token
 
-        client_id_envvar = os.environ.get("FINCH_CLIENT_ID", None)
-        self.client_id = client_id or client_id_envvar or None
+        self.client_id = client_id
 
-        client_secret_envvar = os.environ.get("FINCH_CLIENT_SECRET", None)
-        self.client_secret = client_secret or client_secret_envvar or None
+        self.client_secret = client_secret
 
-        webhook_secret_envvar = os.environ.get("FINCH_WEBHOOK_SECRET", None)
-        self.webhook_secret = webhook_secret or webhook_secret_envvar or None
+        self.webhook_secret = webhook_secret
 
         if base_url is None:
             base_url = f"https://api.tryfinch.com"
@@ -162,10 +159,10 @@ def _validate_headers(self, headers: Headers, custom_headers: Headers) -> None:
     def copy(
         self,
         *,
+        access_token: str | None = None,
         client_id: str | None = None,
         client_secret: str | None = None,
         webhook_secret: str | None = None,
-        access_token: str | None = None,
         base_url: str | None = None,
         timeout: float | Timeout | None | NotGiven = NOT_GIVEN,
         http_client: httpx.Client | None = None,
@@ -219,11 +216,11 @@ def copy(
             http_client = http_client or self._client
 
         return self.__class__(
+            access_token=access_token or self.access_token,
             client_id=client_id or self.client_id,
             client_secret=client_secret or self.client_secret,
             webhook_secret=webhook_secret or self.webhook_secret,
             base_url=base_url or str(self.base_url),
-            access_token=access_token or self.access_token,
             timeout=self.timeout if isinstance(timeout, NotGiven) else timeout,
             http_client=http_client,
             connection_pool_limits=connection_pool_limits,
@@ -354,11 +351,11 @@ class AsyncFinch(AsyncAPIClient):
     def __init__(
         self,
         *,
-        client_id: str | None = None,
-        client_secret: str | None = None,
-        webhook_secret: str | None = None,
+        access_token: str | None = None,
+        client_id: str | None = os.environ.get("FINCH_CLIENT_ID", None),
+        client_secret: str | None = os.environ.get("FINCH_CLIENT_SECRET", None),
+        webhook_secret: str | None = os.environ.get("FINCH_WEBHOOK_SECRET", None),
         base_url: Optional[str] = None,
-        access_token: Optional[str] = None,
         timeout: Union[float, Timeout, None, NotGiven] = NOT_GIVEN,
         max_retries: int = DEFAULT_MAX_RETRIES,
         default_headers: Mapping[str, str] | None = None,
@@ -390,14 +387,11 @@ def __init__(
         """
         self.access_token = access_token
 
-        client_id_envvar = os.environ.get("FINCH_CLIENT_ID", None)
-        self.client_id = client_id or client_id_envvar or None
+        self.client_id = client_id
 
-        client_secret_envvar = os.environ.get("FINCH_CLIENT_SECRET", None)
-        self.client_secret = client_secret or client_secret_envvar or None
+        self.client_secret = client_secret
 
-        webhook_secret_envvar = os.environ.get("FINCH_WEBHOOK_SECRET", None)
-        self.webhook_secret = webhook_secret or webhook_secret_envvar or None
+        self.webhook_secret = webhook_secret
 
         if base_url is None:
             base_url = f"https://api.tryfinch.com"
@@ -454,10 +448,10 @@ def _validate_headers(self, headers: Headers, custom_headers: Headers) -> None:
     def copy(
         self,
         *,
+        access_token: str | None = None,
         client_id: str | None = None,
         client_secret: str | None = None,
         webhook_secret: str | None = None,
-        access_token: str | None = None,
         base_url: str | None = None,
         timeout: float | Timeout | None | NotGiven = NOT_GIVEN,
         http_client: httpx.AsyncClient | None = None,
@@ -511,11 +505,11 @@ def copy(
             http_client = http_client or self._client
 
         return self.__class__(
+            access_token=access_token or self.access_token,
             client_id=client_id or self.client_id,
             client_secret=client_secret or self.client_secret,
             webhook_secret=webhook_secret or self.webhook_secret,
             base_url=base_url or str(self.base_url),
-            access_token=access_token or self.access_token,
             timeout=self.timeout if isinstance(timeout, NotGiven) else timeout,
             http_client=http_client,
             connection_pool_limits=connection_pool_limits,
diff --git a/src/finch/_utils/__init__.py b/src/finch/_utils/__init__.py
index 679193bd..6d13a362 100644
--- a/src/finch/_utils/__init__.py
+++ b/src/finch/_utils/__init__.py
@@ -21,6 +21,9 @@
 from ._utils import extract_type_arg as extract_type_arg
 from ._utils import is_required_type as is_required_type
 from ._utils import is_annotated_type as is_annotated_type
+from ._utils import maybe_coerce_float as maybe_coerce_float
+from ._utils import maybe_coerce_boolean as maybe_coerce_boolean
+from ._utils import maybe_coerce_integer as maybe_coerce_integer
 from ._utils import strip_annotated_type as strip_annotated_type
 from ._transform import PropertyInfo as PropertyInfo
 from ._transform import transform as transform
diff --git a/src/finch/_utils/_utils.py b/src/finch/_utils/_utils.py
index 603f7c10..e43ef6f8 100644
--- a/src/finch/_utils/_utils.py
+++ b/src/finch/_utils/_utils.py
@@ -309,6 +309,24 @@ def coerce_boolean(val: str) -> bool:
     return val == "true" or val == "1" or val == "on"
 
 
+def maybe_coerce_integer(val: str | None) -> int | None:
+    if val is None:
+        return None
+    return coerce_integer(val)
+
+
+def maybe_coerce_float(val: str | None) -> float | None:
+    if val is None:
+        return None
+    return coerce_float(val)
+
+
+def maybe_coerce_boolean(val: str | None) -> bool | None:
+    if val is None:
+        return None
+    return coerce_boolean(val)
+
+
 def removeprefix(string: str, prefix: str) -> str:
     """Remove a prefix from a string.
 
diff --git a/tests/api_resources/hris/benefits/test_individuals.py b/tests/api_resources/hris/benefits/test_individuals.py
index bc2fa85d..2d37e28f 100644
--- a/tests/api_resources/hris/benefits/test_individuals.py
+++ b/tests/api_resources/hris/benefits/test_individuals.py
@@ -17,7 +17,7 @@
 )
 
 base_url = os.environ.get("TEST_API_BASE_URL", "http://127.0.0.1:4010")
-access_token = os.environ.get("API_KEY", "something1234")
+access_token = "My Access Token"
 
 
 class TestIndividuals:
diff --git a/tests/api_resources/hris/test_benefits.py b/tests/api_resources/hris/test_benefits.py
index 5b378abd..3d464f66 100644
--- a/tests/api_resources/hris/test_benefits.py
+++ b/tests/api_resources/hris/test_benefits.py
@@ -17,7 +17,7 @@
 )
 
 base_url = os.environ.get("TEST_API_BASE_URL", "http://127.0.0.1:4010")
-access_token = os.environ.get("API_KEY", "something1234")
+access_token = "My Access Token"
 
 
 class TestBenefits:
diff --git a/tests/api_resources/hris/test_company.py b/tests/api_resources/hris/test_company.py
index 4e789441..9ded6c88 100644
--- a/tests/api_resources/hris/test_company.py
+++ b/tests/api_resources/hris/test_company.py
@@ -11,7 +11,7 @@
 from finch.types.hris import Company
 
 base_url = os.environ.get("TEST_API_BASE_URL", "http://127.0.0.1:4010")
-access_token = os.environ.get("API_KEY", "something1234")
+access_token = "My Access Token"
 
 
 class TestCompany:
diff --git a/tests/api_resources/hris/test_directory.py b/tests/api_resources/hris/test_directory.py
index 3bafc55f..5b4b3ff6 100644
--- a/tests/api_resources/hris/test_directory.py
+++ b/tests/api_resources/hris/test_directory.py
@@ -12,7 +12,7 @@
 from finch.types.hris import IndividualInDirectory
 
 base_url = os.environ.get("TEST_API_BASE_URL", "http://127.0.0.1:4010")
-access_token = os.environ.get("API_KEY", "something1234")
+access_token = "My Access Token"
 
 
 class TestDirectory:
diff --git a/tests/api_resources/hris/test_employments.py b/tests/api_resources/hris/test_employments.py
index 07e36b69..b86990aa 100644
--- a/tests/api_resources/hris/test_employments.py
+++ b/tests/api_resources/hris/test_employments.py
@@ -12,7 +12,7 @@
 from finch.types.hris import EmploymentDataResponse
 
 base_url = os.environ.get("TEST_API_BASE_URL", "http://127.0.0.1:4010")
-access_token = os.environ.get("API_KEY", "something1234")
+access_token = "My Access Token"
 
 
 class TestEmployments:
diff --git a/tests/api_resources/hris/test_individuals.py b/tests/api_resources/hris/test_individuals.py
index 2868e86f..6c910950 100644
--- a/tests/api_resources/hris/test_individuals.py
+++ b/tests/api_resources/hris/test_individuals.py
@@ -12,7 +12,7 @@
 from finch.types.hris import IndividualResponse
 
 base_url = os.environ.get("TEST_API_BASE_URL", "http://127.0.0.1:4010")
-access_token = os.environ.get("API_KEY", "something1234")
+access_token = "My Access Token"
 
 
 class TestIndividuals:
diff --git a/tests/api_resources/hris/test_pay_statements.py b/tests/api_resources/hris/test_pay_statements.py
index 617ea142..cc536268 100644
--- a/tests/api_resources/hris/test_pay_statements.py
+++ b/tests/api_resources/hris/test_pay_statements.py
@@ -12,7 +12,7 @@
 from finch.types.hris import PayStatementResponse
 
 base_url = os.environ.get("TEST_API_BASE_URL", "http://127.0.0.1:4010")
-access_token = os.environ.get("API_KEY", "something1234")
+access_token = "My Access Token"
 
 
 class TestPayStatements:
diff --git a/tests/api_resources/hris/test_payments.py b/tests/api_resources/hris/test_payments.py
index 3c1d61a8..7680f63f 100644
--- a/tests/api_resources/hris/test_payments.py
+++ b/tests/api_resources/hris/test_payments.py
@@ -13,7 +13,7 @@
 from finch.types.hris import Payment
 
 base_url = os.environ.get("TEST_API_BASE_URL", "http://127.0.0.1:4010")
-access_token = os.environ.get("API_KEY", "something1234")
+access_token = "My Access Token"
 
 
 class TestPayments:
diff --git a/tests/api_resources/test_account.py b/tests/api_resources/test_account.py
index c5172b9a..246afef3 100644
--- a/tests/api_resources/test_account.py
+++ b/tests/api_resources/test_account.py
@@ -11,7 +11,7 @@
 from tests.utils import assert_matches_type
 
 base_url = os.environ.get("TEST_API_BASE_URL", "http://127.0.0.1:4010")
-access_token = os.environ.get("API_KEY", "something1234")
+access_token = "My Access Token"
 
 
 class TestAccount:
diff --git a/tests/api_resources/test_providers.py b/tests/api_resources/test_providers.py
index 47e2dc8b..6229d747 100644
--- a/tests/api_resources/test_providers.py
+++ b/tests/api_resources/test_providers.py
@@ -12,7 +12,7 @@
 from finch.pagination import SyncSinglePage, AsyncSinglePage
 
 base_url = os.environ.get("TEST_API_BASE_URL", "http://127.0.0.1:4010")
-access_token = os.environ.get("API_KEY", "something1234")
+access_token = "My Access Token"
 
 
 class TestProviders:
diff --git a/tests/api_resources/test_request_forwarding.py b/tests/api_resources/test_request_forwarding.py
index 3a259596..754acda9 100644
--- a/tests/api_resources/test_request_forwarding.py
+++ b/tests/api_resources/test_request_forwarding.py
@@ -11,7 +11,7 @@
 from tests.utils import assert_matches_type
 
 base_url = os.environ.get("TEST_API_BASE_URL", "http://127.0.0.1:4010")
-access_token = os.environ.get("API_KEY", "something1234")
+access_token = "My Access Token"
 
 
 class TestRequestForwarding:
diff --git a/tests/api_resources/test_top_level.py b/tests/api_resources/test_top_level.py
index daf3c42c..9809a202 100644
--- a/tests/api_resources/test_top_level.py
+++ b/tests/api_resources/test_top_level.py
@@ -9,7 +9,7 @@
 from finch import Finch, AsyncFinch
 
 base_url = os.environ.get("TEST_API_BASE_URL", "http://127.0.0.1:4010")
-access_token = os.environ.get("API_KEY", "something1234")
+access_token = "My Access Token"
 
 
 class TestTopLevel:
diff --git a/tests/api_resources/test_webhooks.py b/tests/api_resources/test_webhooks.py
index 8d3c87e3..4496ea58 100644
--- a/tests/api_resources/test_webhooks.py
+++ b/tests/api_resources/test_webhooks.py
@@ -13,7 +13,7 @@
 from finch import Finch, AsyncFinch
 
 base_url = os.environ.get("TEST_API_BASE_URL", "http://127.0.0.1:4010")
-access_token = os.environ.get("API_KEY", "something1234")
+access_token = "My Access Token"
 
 
 class TestWebhooks:
diff --git a/tests/test_client.py b/tests/test_client.py
index a8d86ce4..762e7bc8 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -26,7 +26,7 @@
 )
 
 base_url = os.environ.get("TEST_API_BASE_URL", "http://127.0.0.1:4010")
-access_token = os.environ.get("API_KEY", "something1234")
+access_token = "My Access Token"
 
 
 def _get_params(client: BaseClient) -> dict[str, str]:
@@ -51,9 +51,9 @@ def test_copy(self) -> None:
         copied = self.client.copy()
         assert id(copied) != id(self.client)
 
-        copied = self.client.copy(access_token="my new access token")
-        assert copied.access_token == "my new access token"
-        assert self.client.access_token == access_token
+        copied = self.client.copy(access_token="another My Access Token")
+        assert copied.access_token == "another My Access Token"
+        assert self.client.access_token == "My Access Token"
 
     def test_copy_default_options(self) -> None:
         # options that have a default are overridden correctly
@@ -680,9 +680,9 @@ def test_copy(self) -> None:
         copied = self.client.copy()
         assert id(copied) != id(self.client)
 
-        copied = self.client.copy(access_token="my new access token")
-        assert copied.access_token == "my new access token"
-        assert self.client.access_token == access_token
+        copied = self.client.copy(access_token="another My Access Token")
+        assert copied.access_token == "another My Access Token"
+        assert self.client.access_token == "My Access Token"
 
     def test_copy_default_options(self) -> None:
         # options that have a default are overridden correctly