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BDX 结账架构与订单流程

BDX 结账流程将买家的购买意愿转化为安全的、有托管保障的订单工作区。该通道管理访客账户创建、验证、原子库存预留、自动交付和状态机流转。

本文档全面介绍结账流程、订单生命周期状态和数字交付机制。

1. 端到端结账流程​

[Buyer Clicks "Buy Now" on Offer Page]
                 |
                 v
      GET /checkout/{offer}?qty=N
                 |
                 +---> Is User Authenticated?
                 |            |
                 |            +---> NO  -> Display "Continue as Guest" Option
                 |            |            Guest inputs email & receives 6-digit verification code
                 |            |            Verifies code to activate guest account
                 |            |
                 |            +---> YES -> Render Checkout View
                 |
                 v
      Order Submission & Safety Checks:
        1. Verify offer is active & buyable
        2. Verify buyer identity & account status
        3. Prevent seller self-purchase
        4. Validate Terms & Risk Acknowledgments
        5. Check for duplicate pending orders
                 |
                 v
      Atomic Stock Reservation:
        Locks offer stock quantity to prevent double-purchases
                 |
                 v
      Order Record Created:
        Status set to pending payment; stock reserved
                 |
                 v
      Payment Method Selection:
                 |
                 +---> BDX Wallet Balance (If balance >= total price)
                 |        |
                 |        v
                 |     Instant payment deducted from wallet
                 |     Mark order paid -> Status: awaiting delivery
                 |     Trigger automated instant delivery (if applicable)
                 |     Redirect to Order Workspace
                 |
                 +---> Online Payment Gateways (bKash, Nagad, etc.)
                 |        |
                 |        v
                 |     Redirect buyer to secure payment portal
                 |     Process payment verification callback
                 |
                 +---> Manual Payment (bKash / Nagad / Rocket / Bank Transfer)
                          |
                          v
                       Redirect to Order Workspace with payment instructions
                       Buyer submits transaction ID / proof screenshot
                       Admin reviews & verifies payment proof

2. 访客结账与邮箱验证​

为减少下单阻力，同时防止垃圾账户和锁库存机器人，BDX 提供精简的访客结账流程：

  1. 访客注册：访客在结账时输入电子邮箱地址，系统自动创建买家账户。
  2. 发送验证码：动态 6 位验证码发送到访客邮箱。
  3. 邮箱验证：输入 6 位验证码即验证邮箱地址并完成订单提交。

3. 订单生命周期与状态​

BDX 上的每笔订单都经过结构化状态机流转。一笔订单包含三个主要状态追踪指标：全局订单状态、支付状态和交付状态。

                    +-----------------------------------+
                    |         ORDER CREATED             |
                    |  status: pending_payment          |
                    |  payment_status: awaiting_payment |
                    |  delivery_status: awaiting_payment|
                    +-----------------+-----------------+
                                      |
                                Payment Verified
                                      |
                    +-----------------v-----------------+
                    |       PAYMENT COMPLETED           |
                    |  status: awaiting_delivery        |
                    |  payment_status: paid             |
                    |  delivery_status: awaiting_seller |
                    +-----------------+-----------------+
                                      |
                             Seller Delivers Item
                                      |
                    +-----------------v-----------------+
                    |        DELIVERY SUBMITTED         |
                    |  status: delivered                |
                    |  payment_status: paid             |
                    |  delivery_status: delivered       |
                    +--------+-----------------+--------+
                             |                 |
             Buyer Confirms /|                 |\ Buyer Opens
             7 Days Elapse   |                 |  Dispute
                             v                 v
                    +--------+--------+ +------+--------+
                    |    COMPLETED    | |   DISPUTED    |
                    | status:         | | status:       |
                    |  completed      | |  disputed     |
                    +-----------------+ +---------------+

订单状态参考表​

全局订单状态支付状态交付状态说明/下一步操作
pending_paymentawaiting_paymentawaiting_payment结账初始状态。库存已预留。等待提交付款或验证。
awaiting_deliverypaidawaiting_seller付款已确认并安全托管。已通知卖家交付商品或服务。
deliveredpaiddelivered卖家已在订单工作区提交交付证明/激活码。7 天买家保障倒计时开始。
completedpaidconfirmed买家已确认收货，或 7 天无纠纷到期。资金释放到卖家钱包可用清算余额。
disputedpaiddisputed买家在 7 天窗口内发起纠纷。托管冻结待仲裁。卖家有 24 小时回复。
cancelledfailed/refundedcancelled订单在交付前取消。预留库存退回库存池。
refundedrefundedrefunded纠纷获批或取消后，可退金额（商品金额；保障费 + 网关手续费不予退还）或部分退款发放到买家 BDX 钱包余额。

4. 库存保护与自动交付​

库存预留保障​

为防止多位买家同时抢购同一稀缺数字商品（如一次性激活码或游戏账号）时的竞态条件：

  • 结账发起瞬间即锁定库存。
  • 如果订单在付款完成前取消或过期，预留数量自动恢复到卖家的有效库存池中。

自动卡密库交付​

对于配置了即时自动交付的报价（如礼品卡、钱包充值码或数字代金券）：

  1. 触发：付款确认后即时启动自动交付。
  2. 分配激活码：系统从卖家加密库存库中提取未兑换的数字码。
  3. 即时交付：数字码安全显示在买家专属订单详情页和消息线程中，订单状态即时更新为已交付。
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