Spec delta: invoice

ADDED Requirements

Requirement: Invoice request

Customers SHALL request at most one open invoice (发票) per order, with title, kind (personal | company), and tax_no required for company invoices. Amount equals the order total in the order currency.

Scenario: company invoice requires tax number

WHEN requesting a company invoice without tax_no
THEN the API returns 400

Scenario: duplicate rejected

WHEN an order already has a requested or issued invoice
THEN a second request returns 409

Requirement: Invoice issuance

Merchants SHALL issue requested invoices of their own shop's orders; issuing sets invoice_no, issued_at and status issued.

Scenario: issue flow

WHEN the shop issues a requested invoice
THEN the customer sees status issued with an invoice number

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