AliExpress Dropshipping

Added 10

• Connection to the official AliExpress Open Platform with the merchant's own free Dropshipping app: App Key and App Secret (secret stored encrypted), authorization of the AliExpress account (OAuth "code for token" through a one-time state, manual code as a fallback), signed requests (HMAC-SHA256), access token refreshed 30 minutes before it expires under a lock, account paused when AliExpress refuses the token.
• Import by AliExpress product link or id (up to 50 at a time) with all SKUs as one option of real combinations, images copied into the store, weight and a cleaned description; a preview shows each SKU with its cost, your price and stock; importing again updates the same product.
• Price rules: percentage markup, fixed amount, endings (x.99, x.95, x.90, whole number), minimum price, list price, USD conversion, overrides per AliExpress category and per product; stock buffer and cap.
• Stock, price and off-sale sync on a schedule; products taken off sale or gone are disabled and enabled again when they come back.
• Orders: the AliExpress products of a paid CS-Cart order are placed on AliExpress at a chosen status (or by hand) at most once: the out_order_id is recorded before the call, a lock per order, an atomic claim; an order whose answer was lost is never resent automatically, the administrator links the AliExpress order id or sends again with the same out_order_id; pay in AliExpress or let AliExpress try to pay at once.
• Delivery option per line from aliexpress.ds.freight.query (cheapest or fastest, tracked only by default) and a checkout shipping method with the AliExpress delivery fee plus a markup.
• Tracking: AliExpress order status, amount and tracking numbers polled and stored; every tracking number becomes a CS-Cart shipment whose link opens the tracking page you choose (Cainiao global tracking, 17TRACK, the carrier's site or your own page); optional order status changes and customer e-mail.
• Multi-Vendor: one AliExpress account for the marketplace or one authorization per vendor through the owner's app; every record scoped by company_id; queue-wide actions and the app credentials administrator-only.
• Uninstall keeps the order and product links, the connection, the rules and the settings unless "Permanently delete AliExpress order and product links on uninstall" is ticked, so a reinstall never buys an order twice or imports a product twice.
• Job queue with retries and back-off, cron (command line and secret address), log viewer with CSV export, Upgrade Synchronizer and domain-bound licence client.

Tested on Multi-Vendor 4.17.2, CS-Cart 4.17.2. First release.