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付款已完成，為什麼平台仍找不到訂單？

鏈上交易完成後，如果平台只等待瀏覽器回傳交易雜湊，關閉分頁或網路中斷就可能造成資訊斷點。這個案例從「鏈上付款如何對應到業務訂單」出發，將前端回傳、後端核對與合約識別分開思考。

支付與對帳架構示意；實際交易條件、確認策略與合約依鏈別和版本而異。

第一階段：辨識前端回傳的限制

交易雜湊可以作為鏈上查詢線索，但不能把使用者一直停留在頁面上當成可靠前提。平台必須有自己的訂單狀態與查核流程，確認交易是否成功、收款對象與資產是否正確，以及金額是否符合條件。

第二階段：主動查核與補償對帳

後端主動取得交易資訊，能補足前端訊息遺失的情況。然而，僅用金額、地址與時間推測訂單仍可能有歧義；不同鏈與錢包模式也不能套用同一套假設。因此這一階段的重點是建立可追查、可複核的對帳能力。

第三階段：讓付款攜帶訂單識別

在支援的合約流程中加入 orderId，讓鏈上支付能帶有明確的業務識別。EIP-712 用於結構化簽名資料的設計，但不會自動保證授權安全或阻止重放，仍需由實作檢查期限、簽署者、網路與唯一性等條件。

串接經驗與工程範圍

團隊累積 40 餘項區塊鏈／資產相關串接經驗，涵蓋不同網路、資產與交易介面的適配。這個數字描述的是開發經歷，不等於本套合約已在 40 多個網路正式上線，也不代表串接了相同數量的交易所。

驗證階段與上線條件

既有技術文章記載 Sepolia 測試網驗證階段；本頁不將它改寫成已完成所有主網部署。正式導入仍須確認合約測試、安全審查、鏈重組處理、事件補掃、重複入帳防護與監控，並依實際網路估算費用，不承諾固定 Gas 成本或零漏單。

EIP-712 結構化簽名標準

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