Fix Charge model validation errors against real API responses

Adds field validators to handle format discrepancies returned by the
Recharge API that differ from strict model expectations:
- Uppercase status/type literals before validation (API sends lowercase)
- Split comma-separated tags string into list
- Coerce empty-list utm_params to None
- Allow None for order_attributes value
- Allow bool for shipping_lines taxable

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: ChemicalLuck

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "recharge-api"
-version = "2.0.1"
+version = "2.0.2"
 authors = [
 	{ name="ChemicalLuck", email="j.tebbett@outlook.com" }
 ]

recharge/model/v2/charge.py

@@ -1,6 +1,6 @@
-from typing import Literal, Optional
+from typing import Any, Literal, Optional, Union
 
-from pydantic import BaseModel, ConfigDict
+from pydantic import BaseModel, ConfigDict, field_validator
 
 ChargeStatus = Literal[
     "SUCCESS", "QUEUED", "ERROR", "REFUNDED", "PARTIALLY_REFUNDED", "SKIPPED"
@@ -26,6 +26,13 @@ class ChargeAnalyticsData(BaseModel):
 
     utm_params: Optional[ChargeAnalyticsDataUtmParams] = None
 
+    @field_validator("utm_params", mode="before")
+    @classmethod
+    def coerce_utm_params(cls, v: Any) -> Any:
+        if isinstance(v, list):
+            return None
+        return v
+
 
 class ChargeBillingAddress(BaseModel):
     model_config = ConfigDict(extra="allow", populate_by_name=True)
@@ -153,7 +160,7 @@ class ChargeOrderAttribute(BaseModel):
     model_config = ConfigDict(extra="allow", populate_by_name=True)
 
     name: str
-    value: str
+    value: Optional[str] = None
 
 
 class ChargeShippingAddress(BaseModel):
@@ -178,13 +185,27 @@ class ChargeShippingLine(BaseModel):
     price: Optional[str] = None
     source: Optional[str] = None
     title: Optional[str] = None
-    taxable: Optional[str] = None
+    taxable: Optional[Union[str, bool]] = None
     tax_lines: list[ChargeTaxLine] = []
 
 
 class Charge(BaseModel):
     model_config = ConfigDict(extra="allow", populate_by_name=True)
 
+    @field_validator("status", "type", mode="before")
+    @classmethod
+    def uppercase_literals(cls, v: Any) -> Any:
+        if isinstance(v, str):
+            return v.upper()
+        return v
+
+    @field_validator("tags", mode="before")
+    @classmethod
+    def coerce_tags(cls, v: Any) -> Any:
+        if isinstance(v, str):
+            return [t.strip() for t in v.split(",") if t.strip()]
+        return v
+
     id: int
     address_id: Optional[int] = None
     analytics_data: Optional[ChargeAnalyticsData] = None