diff --git a/open_feature/flag_evaluation/error_code.py b/open_feature/exception/error_code.py
similarity index 70%
rename from open_feature/flag_evaluation/error_code.py
rename to open_feature/exception/error_code.py
index 79506ffd..96c59546 100644
--- a/open_feature/flag_evaluation/error_code.py
+++ b/open_feature/exception/error_code.py
@@ -6,4 +6,6 @@ class ErrorCode(Enum):
     FLAG_NOT_FOUND = "FLAG_NOT_FOUND"
     PARSE_ERROR = "PARSE_ERROR"
     TYPE_MISMATCH = "TYPE_MISMATCH"
+    TARGETING_KEY_MISSING = "TARGETING_KEY_MISSING"
+    INVALID_CONTEXT = "INVALID_CONTEXT"
     GENERAL = "GENERAL"
diff --git a/open_feature/exception/exceptions.py b/open_feature/exception/exceptions.py
index b23eee03..4366db12 100644
--- a/open_feature/exception/exceptions.py
+++ b/open_feature/exception/exceptions.py
@@ -1,4 +1,6 @@
-from open_feature.flag_evaluation.error_code import ErrorCode
+import typing
+
+from open_feature.exception.error_code import ErrorCode
 
 
 class OpenFeatureError(Exception):
@@ -7,13 +9,14 @@ class OpenFeatureError(Exception):
     the more specific exceptions extending this one should be used.
     """
 
-    def __init__(self, error_message: str = None, error_code: ErrorCode = None):
+    def __init__(
+        self, error_message: typing.Optional[str] = None, error_code: ErrorCode = None
+    ):
         """
         Constructor for the generic OpenFeatureError.
-        @param error_message: a string message representing why the error has been
-        raised
+        @param error_message: an optional string message representing why the
+        error has been raised
         @param error_code: the ErrorCode string enum value for the type of error
-        @return: the generic OpenFeatureError exception
         """
         self.error_message = error_message
         self.error_code = error_code
@@ -25,13 +28,12 @@ class FlagNotFoundError(OpenFeatureError):
     key provided by the user.
     """
 
-    def __init__(self, error_message: str = None):
+    def __init__(self, error_message: typing.Optional[str] = None):
         """
         Constructor for the FlagNotFoundError.  The error code for
         this type of exception is ErrorCode.FLAG_NOT_FOUND.
-        @param error_message: a string message representing why the error has been
-        raised
-        @return: the generic FlagNotFoundError exception
+        @param error_message: an optional string message representing
+        why the error has been raised
         """
         super().__init__(error_message, ErrorCode.FLAG_NOT_FOUND)
 
@@ -42,13 +44,12 @@ class GeneralError(OpenFeatureError):
     feature python sdk.
     """
 
-    def __init__(self, error_message: str = None):
+    def __init__(self, error_message: typing.Optional[str] = None):
         """
         Constructor for the GeneralError.  The error code for this type of exception
         is ErrorCode.GENERAL.
-        @param error_message: a string message representing why the error has been
-        raised
-        @return: the generic GeneralError exception
+        @param error_message: an optional string message representing why the error
+        has been raised
         """
         super().__init__(error_message, ErrorCode.GENERAL)
 
@@ -59,13 +60,12 @@ class ParseError(OpenFeatureError):
     be parsed into a FlagEvaluationDetails object.
     """
 
-    def __init__(self, error_message: str = None):
+    def __init__(self, error_message: typing.Optional[str] = None):
         """
         Constructor for the ParseError. The error code for this type of exception
         is ErrorCode.PARSE_ERROR.
-        @param error_message: a string message representing why the error has been
-        raised
-        @return: the generic ParseError exception
+        @param error_message: an optional string message representing why the
+        error has been raised
         """
         super().__init__(error_message, ErrorCode.PARSE_ERROR)
 
@@ -76,12 +76,11 @@ class TypeMismatchError(OpenFeatureError):
     not match the type requested by the user.
     """
 
-    def __init__(self, error_message: str = None):
+    def __init__(self, error_message: typing.Optional[str] = None):
         """
         Constructor for the TypeMismatchError. The error code for this type of
         exception is ErrorCode.TYPE_MISMATCH.
-        @param error_message: a string message representing why the error has been
-        raised
-        @return: the generic TypeMismatchError exception
+        @param error_message: an optional string message representing why the
+        error has been raised
         """
         super().__init__(error_message, ErrorCode.TYPE_MISMATCH)
diff --git a/open_feature/flag_evaluation/flag_evaluation_details.py b/open_feature/flag_evaluation/flag_evaluation_details.py
index 0caf4c0c..63aa937f 100644
--- a/open_feature/flag_evaluation/flag_evaluation_details.py
+++ b/open_feature/flag_evaluation/flag_evaluation_details.py
@@ -1,7 +1,7 @@
 import typing
 from dataclasses import dataclass
 
-from open_feature.flag_evaluation.error_code import ErrorCode
+from open_feature.exception.error_code import ErrorCode
 from open_feature.flag_evaluation.reason import Reason
 
 
@@ -12,4 +12,4 @@ class FlagEvaluationDetails:
     variant: str = None
     reason: Reason = None
     error_code: ErrorCode = None
-    error_message: str = None
+    error_message: typing.Optional[str] = None
diff --git a/open_feature/flag_evaluation/flag_evaluation_options.py b/open_feature/flag_evaluation/flag_evaluation_options.py
new file mode 100644
index 00000000..1a35542d
--- /dev/null
+++ b/open_feature/flag_evaluation/flag_evaluation_options.py
@@ -0,0 +1,10 @@
+import typing
+from dataclasses import dataclass, field
+
+from open_feature.hooks.hook import Hook
+
+
+@dataclass
+class FlagEvaluationOptions:
+    hooks: typing.List[Hook] = field(default_factory=list)
+    hook_hints: dict = field(default_factory=dict)
diff --git a/open_feature/flag_evaluation/flag_type.py b/open_feature/flag_evaluation/flag_type.py
index 1fd52d7c..eec9604c 100644
--- a/open_feature/flag_evaluation/flag_type.py
+++ b/open_feature/flag_evaluation/flag_type.py
@@ -6,3 +6,5 @@ class FlagType(Enum):
     STRING = 2
     NUMBER = 3
     OBJECT = 4
+    FLOAT = 5
+    INTEGER = 6
diff --git a/open_feature/open_feature_client.py b/open_feature/open_feature_client.py
index 8be455ef..69fef4b2 100644
--- a/open_feature/open_feature_client.py
+++ b/open_feature/open_feature_client.py
@@ -3,9 +3,14 @@
 from numbers import Number
 
 from open_feature.evaluation_context.evaluation_context import EvaluationContext
-from open_feature.exception.exceptions import GeneralError, OpenFeatureError
-from open_feature.flag_evaluation.error_code import ErrorCode
+from open_feature.exception.error_code import ErrorCode
+from open_feature.exception.exceptions import (
+    GeneralError,
+    OpenFeatureError,
+    TypeMismatchError,
+)
 from open_feature.flag_evaluation.flag_evaluation_details import FlagEvaluationDetails
+from open_feature.flag_evaluation.flag_evaluation_options import FlagEvaluationOptions
 from open_feature.flag_evaluation.flag_type import FlagType
 from open_feature.flag_evaluation.reason import Reason
 from open_feature.hooks.hook import Hook
@@ -20,6 +25,8 @@
 from open_feature.provider.no_op_provider import NoOpProvider
 from open_feature.provider.provider import AbstractProvider
 
+NUMERIC_TYPES = [FlagType.FLOAT, FlagType.INTEGER]
+
 
 class OpenFeatureClient:
     def __init__(
@@ -129,6 +136,64 @@ def get_number_details(
             flag_evaluation_options,
         )
 
+    def get_integer_value(
+        self,
+        flag_key: str,
+        default_value: int,
+        evaluation_context: EvaluationContext = None,
+        flag_evaluation_options: typing.Any = None,
+    ) -> int:
+        return self.get_integer_details(
+            flag_key,
+            default_value,
+            evaluation_context,
+            flag_evaluation_options,
+        ).value
+
+    def get_integer_details(
+        self,
+        flag_key: str,
+        default_value: int,
+        evaluation_context: EvaluationContext = None,
+        flag_evaluation_options: typing.Any = None,
+    ) -> FlagEvaluationDetails:
+        return self.evaluate_flag_details(
+            FlagType.INTEGER,
+            flag_key,
+            default_value,
+            evaluation_context,
+            flag_evaluation_options,
+        )
+
+    def get_float_value(
+        self,
+        flag_key: str,
+        default_value: float,
+        evaluation_context: EvaluationContext = None,
+        flag_evaluation_options: typing.Any = None,
+    ) -> float:
+        return self.get_float_details(
+            flag_key,
+            default_value,
+            evaluation_context,
+            flag_evaluation_options,
+        ).value
+
+    def get_float_details(
+        self,
+        flag_key: str,
+        default_value: float,
+        evaluation_context: EvaluationContext = None,
+        flag_evaluation_options: typing.Any = None,
+    ) -> FlagEvaluationDetails:
+        return self.evaluate_flag_details(
+            FlagType.FLOAT,
+            flag_key,
+            default_value,
+            evaluation_context,
+            flag_evaluation_options,
+        )
+
     def get_object_value(
         self,
         flag_key: str,
@@ -165,7 +230,7 @@ def evaluate_flag_details(
         flag_key: str,
         default_value: typing.Any,
         evaluation_context: EvaluationContext = None,
-        flag_evaluation_options: typing.Any = None,
+        flag_evaluation_options: FlagEvaluationOptions = None,
     ) -> FlagEvaluationDetails:
         """
         Evaluate the flag requested by the user from the clients provider.
@@ -182,6 +247,9 @@ def evaluate_flag_details(
         if evaluation_context is None:
             evaluation_context = EvaluationContext()
 
+        if flag_evaluation_options is None:
+            flag_evaluation_options = FlagEvaluationOptions()
+
         hook_context = HookContext(
             flag_key=flag_key,
             flag_type=flag_type,
@@ -190,18 +258,21 @@ def evaluate_flag_details(
             client_metadata=None,
             provider_metadata=None,
         )
-        merged_hooks = self.hooks
+        merged_hooks = (
+            self.provider.get_provider_hooks()
+            + flag_evaluation_options.hooks
+            + self.hooks
+        )
 
         try:
             # https://github.com/open-feature/spec/blob/main/specification/sections/03-evaluation-context.md
             # Any resulting evaluation context from a before hook will overwrite
             # duplicate fields defined globally, on the client, or in the invocation.
+            # Requirement 3.2.2, 4.3.4: API.context->client.context->invocation.context
             invocation_context = before_hooks(
                 flag_type, hook_context, merged_hooks, None
             )
             invocation_context.merge(ctx2=evaluation_context)
-
-            # merge of: API.context, client.context, invocation.context
             merged_context = (
                 api_evaluation_context().merge(self.context).merge(invocation_context)
             )
@@ -213,7 +284,7 @@ def evaluate_flag_details(
                 merged_context,
             )
 
-            after_hooks(type, hook_context, flag_evaluation, merged_hooks, None)
+            after_hooks(flag_type, hook_context, flag_evaluation, merged_hooks, None)
 
             return flag_evaluation
 
@@ -272,6 +343,8 @@ def _create_provider_evaluation(
         get_details_callable = {
             FlagType.BOOLEAN: self.provider.get_boolean_details,
             FlagType.NUMBER: self.provider.get_number_details,
+            FlagType.INTEGER: self.provider.get_number_details,
+            FlagType.FLOAT: self.provider.get_number_details,
             FlagType.OBJECT: self.provider.get_object_details,
             FlagType.STRING: self.provider.get_string_details,
         }.get(flag_type)
@@ -279,4 +352,21 @@ def _create_provider_evaluation(
         if not get_details_callable:
             raise GeneralError(error_message="Unknown flag type")
 
-        return get_details_callable(*args)
+        value = get_details_callable(*args)
+
+        if flag_type in NUMERIC_TYPES:
+            value.value = self._convert_numeric_types(flag_type, value.value)
+
+        return value
+
+    @staticmethod
+    def _convert_numeric_types(flag_type: FlagType, current_value: Number):
+        converter = {
+            FlagType.FLOAT: float,
+            FlagType.INTEGER: int,
+        }.get(flag_type)
+
+        try:
+            return converter(current_value)
+        except ValueError:
+            raise TypeMismatchError()
diff --git a/open_feature/provider/no_op_provider.py b/open_feature/provider/no_op_provider.py
index 8e80786a..8dd210d5 100644
--- a/open_feature/provider/no_op_provider.py
+++ b/open_feature/provider/no_op_provider.py
@@ -1,8 +1,10 @@
+import typing
 from numbers import Number
 
 from open_feature.evaluation_context.evaluation_context import EvaluationContext
 from open_feature.flag_evaluation.flag_evaluation_details import FlagEvaluationDetails
 from open_feature.flag_evaluation.reason import Reason
+from open_feature.hooks.hook import Hook
 from open_feature.provider.metadata import Metadata
 from open_feature.provider.no_op_metadata import NoOpMetadata
 from open_feature.provider.provider import AbstractProvider
@@ -14,6 +16,9 @@ class NoOpProvider(AbstractProvider):
     def get_metadata(self) -> Metadata:
         return NoOpMetadata()
 
+    def get_provider_hooks(self) -> typing.List[Hook]:
+        return []
+
     def get_boolean_details(
         self,
         flag_key: str,
diff --git a/open_feature/provider/provider.py b/open_feature/provider/provider.py
index db99373d..957beb14 100644
--- a/open_feature/provider/provider.py
+++ b/open_feature/provider/provider.py
@@ -1,7 +1,9 @@
+import typing
 from abc import abstractmethod
 from numbers import Number
 
 from open_feature.evaluation_context.evaluation_context import EvaluationContext
+from open_feature.hooks.hook import Hook
 from open_feature.provider.metadata import Metadata
 
 
@@ -10,6 +12,10 @@ class AbstractProvider:
     def get_metadata(self) -> Metadata:
         pass
 
+    @abstractmethod
+    def get_provider_hooks(self) -> typing.List[Hook]:
+        return []
+
     @abstractmethod
     def get_boolean_details(
         self,
diff --git a/tests/test_open_feature_api.py b/tests/test_open_feature_api.py
index c3bee46d..ae687146 100644
--- a/tests/test_open_feature_api.py
+++ b/tests/test_open_feature_api.py
@@ -1,7 +1,7 @@
 import pytest
 
+from open_feature.exception.error_code import ErrorCode
 from open_feature.exception.exceptions import GeneralError
-from open_feature.flag_evaluation.error_code import ErrorCode
 from open_feature.open_feature_api import get_client, get_provider, set_provider
 from open_feature.provider.no_op_provider import NoOpProvider
 
diff --git a/tests/test_open_feature_client.py b/tests/test_open_feature_client.py
index 9e7fb5ee..52fc04eb 100644
--- a/tests/test_open_feature_client.py
+++ b/tests/test_open_feature_client.py
@@ -3,8 +3,8 @@
 
 import pytest
 
+from open_feature.exception.error_code import ErrorCode
 from open_feature.exception.exceptions import OpenFeatureError
-from open_feature.flag_evaluation.error_code import ErrorCode
 from open_feature.flag_evaluation.reason import Reason
 from open_feature.hooks.hook import Hook
 
@@ -15,6 +15,8 @@
         (bool, True, "get_boolean_value"),
         (str, "String", "get_string_value"),
         (Number, 100, "get_number_value"),
+        (int, 100, "get_integer_value"),
+        (float, 10.23, "get_float_value"),
         (
             dict,
             {
@@ -46,6 +48,8 @@ def test_should_get_flag_value_based_on_method_type(
         (bool, True, "get_boolean_details"),
         (str, "String", "get_string_details"),
         (Number, 100, "get_number_details"),
+        (int, 100, "get_integer_details"),
+        (float, 10.23, "get_float_details"),
         (
             dict,
             {
diff --git a/tests/test_open_feature_evaluation_context.py b/tests/test_open_feature_evaluation_context.py
index fc353d96..41539a60 100644
--- a/tests/test_open_feature_evaluation_context.py
+++ b/tests/test_open_feature_evaluation_context.py
@@ -1,8 +1,8 @@
 import pytest
 
 from open_feature.evaluation_context.evaluation_context import EvaluationContext
+from open_feature.exception.error_code import ErrorCode
 from open_feature.exception.exceptions import GeneralError
-from open_feature.flag_evaluation.error_code import ErrorCode
 from open_feature.open_feature_evaluation_context import (
     api_evaluation_context,
     set_api_evaluation_context,