Technical
Deep dives into Shopify Functions, checkout validation, and the technical foundations of server-side order enforcement.
Shopify Delivery Date Validation: Block Missing, Closed and Full Dates at Checkout
A delivery date picker only shows dates. Validation is what stops an order with no date, a closed date or a full date from going through. Here are the checks that matter, the exact messages customers see, three ways to get it on Shopify, and what it still can't catch.
Four Ways Shoppers Skip Your Delivery Date Picker: Buy It Now, Shop Pay, Checkout Links and AI Agents
An order arrives with no date, or a customer says checkout wouldn't let them pay. Almost always, the shopper went around your picker. Here are the four common ways it happens, Buy it now, wallet buttons, checkout links and AI agents, and the fix for each.
Estimated Delivery Dates That Account for Japanese Holidays
Show an 'Arrives' estimate on Shopify product pages with holiday-aware business-day counting that skips weekends, blackout dates, and Japanese national holidays.
Hand Shipment Data to Yamato, Sagawa & Japan Post via CSV (Shopify)
Export Shopify shipments into the official Yamato B2クラウド, Sagawa e飛伝III, and Japan Post ゆうプリR CSV layouts — Shift-JIS, one row per shipment, with tracking import.
How Shopify Checkout Validation Works (and How Apps Use It to Block Orders)
How Shopify's Cart and Checkout Validation Functions work: where they run and where they don't, what data a Function can see, what it can and can't do, which plans can use it, and how apps like OrderRules use it to block orders.