“购买配送”如何运作？
“购买配送”通过提供最有可能实现买家配送承诺的配送方式来保护卖家的绩效指标。“购买配送”使用配送方式的运输时间 (TT)、发货日期和承诺送达日期来确定配送方式是否有可能准时送达。
运输时间 (TT) 是承运人表明在从卖家处取件后配送包裹的时间。TT 基于配送线路，即“发货”和“收货”地址的邮政编码对。例如，如果您从纽约市发往加利福尼亚州洛杉矶，则配送线路可能为 10001 到 90001。
“购买配送”将使用订单的“发货”和“收货”地址查询承运人，以获取符合买家的“承诺送达日期”(PDD) 要求的配送方式。“购买配送”收到承运人符合要求的配送方式后，亚马逊将使用亚马逊运输数据验证订单配送线路上的实际 TT 是否与承运人提供的相似。
“购买配送”将使用“发货日期”和 TT 确定订单的“预计送达日期”(EDD)。如果 EDD 在 PDD 之后，配送方式将不符合配送订单的要求。
由于亚马逊使用内部运输数据来确定符合要求的配送方式，因此配送方式可能显示在承运人的网站上，而不适用于“购买配送”。
请注意，这是预期行为，因为我们的内部运输数据可能反映与在承运人网站上购买的商品存在差异。此行为是预期的，因为我们仅会显示已证明符合买家提供的配送承诺的配送方式。
亚马逊官网原文详情：
How does Buy Shipping work?
Buy Shipping protects sellers’ performance metrics by providing ship methods with a high likelihood of meeting the buyer’s delivery promise. Buy Shipping uses a ship method’s Transit Time (TT), the ship date, and the promised delivery date to determine whether a ship method is likely to be delivered on time.
Transit Time (TT) is the time the carrier has stated it will take them to deliver a package after they pick up from the seller. The TT is based upon a ship lane, which is the "Ship From" and "Ship To" zip code pair. For example, if you are shipping from New York City to Los Angeles, CA, the ship lane could be 10001 to 90001.
Buy Shipping will use the order’s "Ship From" and "Ship To" addresses to query carriers for their eligible ship methods that will meet the buyer’s "Promised Delivery Date" (PDD). After Buy Shipping receives the carriers’ eligible ship methods, it will use Amazon transportation data to validate that the actual TT on the order’s ship lane is similar to what was provided by the carrier.
Buy Shipping will use the "Ship Date" and TT to determine the "Expected Delivery Date" (EDD) of the order. If the EDD is after the PDD, the ship method will be ineligible to fulfill the order.
Because Amazon uses internal transportation data to identify eligible ship methods, it is possible for a ship method to be available on a carrier’s website and NOT available on Buy Shipping.
Please note, this is expected behavior as our internal transportation data may reflect differences from what is purchased on the carrier’s website. This behavior is expected as we are only surfacing ship methods that have shown to meet the delivery promises provided by the buyer.
文章来源：亚马逊官方网站
