使用Stripe Tax计算加州销售税异常：未生成7.25%税率问题排查

我正在尝试使用Stripe Python库计算Stripe税，调用代码如下：

resp = stripe.tax.Calculation.create(
    currency=USD_ISO_CODE,
    line_items=[{"amount": total_base_cost, "reference": "L1"}],
    shipping_cost={"amount": shipping_cost, "tax_code": "txcd_92010001"},
    customer_details={
        "address": {
            "line1": "500 Anton Blvd",
            "city": "Costa Mesa",
            "state": "CA",
            "postal_code": "92626",
            "country": "US",
        },
        "address_source": "billing",
    },
)

返回的响应结果如下：

{
  "amount_total": 1354611,
  "currency": "usd",
  "customer": null,
  "customer_details": {
    "address": {
      "city": "Costa Mesa",
      "country": "US",
      "line1": "500 Anton Blvd",
      "line2": null,
      "postal_code": "92626",
      "state": "CA"
    },
    "address_source": "billing",
    "ip_address": null,
    "tax_ids": [],
    "taxability_override": "none"
  },
  "expires_at": 1695435437,
  "id": "taxcalc_1NscS9GRnWL3YYIB9Tn5yAAG",
  "livemode": false,
  "object": "tax.calculation",
  "shipping_cost": {
    "amount": 0,
    "amount_tax": 0,
    "tax_behavior": "exclusive",
    "tax_code": "txcd_92010001"
  },
  "tax_amount_exclusive": 0,
  "tax_amount_inclusive": 0,
  "tax_breakdown": [
    {
      "amount": 0,
      "inclusive": false,
      "tax_rate_details": {
        "country": "HK",
        "percentage_decimal": "0.0",
        "state": null,
        "tax_type": null
      },
      "taxability_reason": "not_subject_to_tax",
      "taxable_amount": 0
    }
  ],
  "tax_date": 1695262637
}

已知加州实行7.25%的目的地销售税，但该税额未被计算，响应中税务原因标注为"taxability_reason": "not_subject_to_tax"。我的Stripe税设置中，商品类型为"Tangible goods"，业务起源地为中国香港。请问问题出在哪里？为何Stripe未计算加州销售税？

• 未完成美国加州税务登记：香港商家向美国加州销售有形商品，需先完成加州销售税登记（获取seller's permit）。Stripe Tax的税费计算依赖于商家是否拥有对应地区的纳税登记资质，若未登记，Stripe会判定你无该地区纳税义务，因此标记为"not_subject_to_tax"。

• Stripe Tax配置缺失：仅设置商品类型为"Tangible goods"不够，需在Stripe Tax后台配置美国地区的税务登记信息（如加州的销售税登记号）。没有这些信息，Stripe无法识别你的纳税义务范围，不会自动计算加州销售税。

• 商品税码未指定：API调用的line_items中未设置tax_code，虽然运费指定了税码，但主商品缺少明确的税码标识。Stripe需要通过税码确认商品的应税属性，缺失该字段可能导致系统无法正确识别商品为应税有形商品，进而跳过税费计算。

内容的提问来源于stack exchange，提问作者mrQWERTY