Changelog

Next release: a discount with a rate per product#

New: POST /v1/api/promotions/discount and PATCH /v1/api/promotions/discount/{id} take product_discounts: [{ sku, discount_type, value }], a rate per SKU off every unit of it (up to 500 SKUs), instead of discount_type, value and applies_to. One promotion holds the whole sale, so it switches on and off at once. It reads back the same way it is written.

Fixed: GET /v1/api/products answered stock: { on_hand: null, available: null } for every product. It now returns the counted and sellable numbers.
Variants: a new variant (parent_sku) that gives no category or brand takes the main product's. Anything the row gives still wins.
Clearer errors: a new product missing several required fields is told all of them at once, for example A new product needs name, price and brand.

Connector at https://mcp.sellersidekick.ai/mcp for Claude, ChatGPT, Gemini Enterprise and Gemini CLI. You sign in with SellerSideKick and choose the shop and permissions. See Connect ChatGPT, Claude or Gemini.
Permissions on API keys: catalog:read, catalog:write, stock:write, promotions:write. Existing keys and new keys default to full access. A call outside a key's permissions answers 403 Y35.
Key expiry: never, 30, 90 or 365 days, with a reminder email 7 days before. An expired key answers 401 Y22.
Connected AI assistants are listed in Settings → API keys, each with a Disconnect button. Recent API changes there shows what keys and assistants changed, before and after.
Change log in Settings → API keys: every change made through a key or an assistant, with the value before and after.
These docs, llms.txt and a Markdown copy of every page.

The OpenAPI spec is published at https://api.sellersidekick.ai/v1/api/openapi.json, written for AI agents: when to call each operation, what to check first, whether a retry is safe, with examples.
Usage counters per key and per shop in Settings → API keys: calls, errors, rate-limited calls, dry runs and rows written, today and over the last 30 days.