Custom store API / Changelog

Changelog

v1.1 — 2026-11-12

Added order writes (optional): cancellation, return and exchange requests, address changes, order memos
Added coupons (optional): coupon list, member's coupons, coupon issuing
Added categories and the full catalog list (since_product_no) — syncs the knowledge “Products” folder
Added the Idempotency-Key header on every write, the { "error": { "code", "message" } } error body and the error code table
New capabilities keys: spec_version, claims, receiver_update, memos, coupons, coupon_issue, categories, catalog, pagination
Cafe24-style offset pagination ("pagination": "offset")
Clarified the item image rule: an absolute https URL instead of an empty string, falling back to the product's main image when the option has no photo

v1.0 integrations keep working as is. v1.1 features are called only when turned on in capabilities.

First release: order list and detail, shipments, members, product search and detail, capabilities
Aligned field names with the Cafe24 Admin API (snake_case)
API version header X-Lillo-Api-Version: 2026-11-01