inventory-plus-plus/STORE_API_RESEARCH.md

Store API Research

https://docs.google.com/spreadsheets/d/1xWfXn-wbiHTBeqyhnq0b46_sgLGyiYc_5N5mXKYD1R8/edit?gid=0#gid=0

Platform	Order Event: placed	Order Event: changed	Products List	Products Look up	Inventory Look up	Inventory Update	Inventory Event: change
Shopify	orders/create	orders/cancelled, orders/delete, orders/paid, etc	/queries/products	/queries/product	/queries/product	/mutations/inventorySetQuantities	inventory_levels/update
WooCommerce	webhook order.created	webhook order.updated, order.deleted	GET /wp-json/wc/v3/products	GET /wp-json/wc/v3/products/<id>	stock_quantity field on product resource	PUT /wp-json/wc/v3/products/<id> (stock_quantity), or /products/batch	product.updated (no dedicated inventory webhook)
BigCommerce	webhook store/order/created	webhook store/order/updated, store/order/statusUpdated	GET /v3/catalog/products	GET /v3/catalog/products/{product_id}	GET /v3/inventory/items	PUT /v3/inventory/adjustments/absolute (also /relative)	store/product/inventory/updated
Wix	webhook wix.ecom.v1.order.created	webhook wix.ecom.v1.order.updated (also .canceled)	Query Products (Catalog V3)	Get Product	Query Inventory Items	Update Inventory Variants	wix.stores.catalog.v3.inventory_item.updated
Squarespace	webhook order.create	webhook order.update (FULFILLED, REFUNDED, CANCELED, MARKED_PENDING, EMAIL_UPDATED)	GET /v2/commerce/products	GET /v2/commerce/products/{productIdCsvs}	GET /1.0/commerce/inventory/{variantIdCsvs}	POST /1.0/commerce/inventory/adjustments	N/A (no inventory webhook topic)
Square Online	webhook order.created	webhook order.updated, order.fulfillment.updated	GET /v2/catalog/list	GET /v2/catalog/object/{object_id}	POST /v2/inventory/counts/batch-retrieve	POST /v2/inventory/changes/batch-create (BatchChangeInventory)	webhook inventory.count.updated
Zoho	webhook salesorder.created (Zoho Commerce)	webhook salesorder.confirmed, .cancelled, .declined, .shipped, .delivered	GET /store/api/v1/products	GET /store/api/v1/products/{product_id}	GET /store/api/v1/variants (stock_on_hand, actual_available_stock)	POST /store/api/v1/inventoryadjustments	N/A (no inventory/stock webhook event)
Ecwid	webhook order.created	webhook order.updated, order.deleted	GET /api/v3/{storeId}/products	GET /api/v3/{storeId}/products/{productId}	GET /api/v3/{storeId}/products/{productId} (quantity/unlimited)	PUT /api/v3/{storeId}/products/{productId}/inventory (quantityDelta)	product.updated webhook
Big Cartel	webhook order.create (app-approved)	webhook order.update (app-approved)	GET /v1/accounts/{account_id}/products	GET /v1/accounts/{account_id}/products/{id}	N/A — no dedicated inventory field/endpoint	N/A — no inventory update endpoint	N/A — no inventory-specific webhook
Amazon	ORDER_CHANGE notification (SP-API)	ORDER_CHANGE notification (same type, status delta)	searchCatalogItems (GET /catalog/2022-04-01/items)	getCatalogItem (GET /catalog/2022-04-01/items/{asin})	getInventorySummaries (FBA Inventory API, GET /fba/inventory/v1/summaries)	patchListingsItem (PATCH /listings/2021-08-01/items/{sellerId}/{sku})	FBA_INVENTORY_AVAILABILITY_CHANGES notification
Walmart Marketplace	PO created event (webhook)	Order intent to cancel / PO line auto-cancelled event (webhook); status flow Created→Acknowledged→Shipped→Delivered/Cancelled	GET /v3/items (getAllItems)	GET /v3/items/{id} (getAnItem)	GET /v3/inventory?sku={sku}	PUT /v3/inventory (also bulk via POST /v3/feeds)	Inventory OOS event (webhook)
Ebay	FixedPriceTransaction / ItemSold (Platform Notifications, legacy Trading API)	ItemMarkedShipped notification; also getOrders filtered by lastmodifieddate (Fulfillment API)	GET /sell/inventory/v1/inventory_item (getInventoryItems)	GET /sell/inventory/v1/inventory_item/{sku} (getInventoryItem)	GET /sell/inventory/v1/inventory_item/{sku} (availability.shipToLocationAvailability)	POST /sell/inventory/v1/bulk_update_price_quantity (bulkUpdatePriceQuantity)	N/A — no dedicated inventory-change topic found

Platform	Docs	Webhooks	API
Shopify	https://shopify.dev/docs/api	https://shopify.dev/docs/api/webhooks/latest?reference=toml	https://shopify.dev/docs/api/admin-graphql/latest
WooCommerce	https://developer.woocommerce.com/docs/apis/rest-api/	https://developer.woocommerce.com/docs/apis/rest-api/v2/webhooks/	https://developer.woocommerce.com/docs/apis/rest-api/v3/products/
BigCommerce	https://developer.bigcommerce.com/docs	https://developer.bigcommerce.com/docs/integrations/webhooks/overview	https://developer.bigcommerce.com/docs/rest-catalog/products
Wix	https://dev.wix.com/docs	https://dev.wix.com/docs/build-apps/develop-your-app/api-integrations/events-and-webhooks/about-webhooks	https://dev.wix.com/docs/api-reference
Squarespace	https://developers.squarespace.com/commerce-apis/overview	https://developers.squarespace.com/commerce-apis/webhooksubscriptions-overview	https://developers.squarespace.com/commerce-apis/overview
Square Online	https://developer.squareup.com/docs	https://developer.squareup.com/docs/webhooks/overview	https://developer.squareup.com/reference/square
Zoho	https://www.zoho.com/commerce/api/introduction.html	https://www.zoho.com/commerce/api/webhooks.html	https://www.zoho.com/commerce/api/apis-list.html
Ecwid	https://docs.ecwid.com/	https://docs.ecwid.com/webhook-automations	https://api-docs.ecwid.com/reference
Big Cartel	https://developers.bigcartel.com/	https://developers.bigcartel.com/api/v1 (webhooks section, no standalone page)	https://developers.bigcartel.com/api/v1
Amazon	https://developer-docs.amazon.com/sp-api/docs/welcome	https://developer-docs.amazon.com/sp-api/docs/notifications-api-v1-use-case-guide	https://developer-docs.amazon.com/sp-api/reference
Walmart Marketplace	https://developer.walmart.com/	https://developer.walmart.com/doc/us/mp/us-mp-notifications/	https://developer.walmart.com/us-marketplace/docs/inventory-api-overview
Ebay	https://developer.ebay.com/develop	https://developer.ebay.com/api-docs/commerce/notification/overview.html	https://developer.ebay.com/api-docs/sell/inventory/overview.html

Notes / caveats from research

• Square Online: no separate API — orders, catalog, and inventory are handled by Square's core Seller APIs (developer.squareup.com), the same ones used across all Square products. Unrelated to Squarespace despite the name.
• Zoho: "Zoho Commerce" (commerce.zoho.com) is the storefront product comparable to Shopify/Squarespace and owns the order/product/webhook APIs listed above. Zoho Inventory is a separate warehouse/stock-management app with its own API but no documented webhook support.
• Big Cartel: no true inventory API — only an inventory_enabled flag and quantity_gte/quantity_lte filters on products. No endpoint to set stock and no inventory-change webhook. Webhook access is gated per-app approval; exact topic names are inferred from integration examples since Big Cartel has no canonical published list.
• Amazon SP-API: no separate "placed" vs "changed" order topics — both flow through a single ORDER_CHANGE notification, differentiated by payload content.
• WooCommerce / Ecwid: neither has a dedicated inventory-change webhook; stock changes surface via the general product.updated event instead.
• Ebay: order-event names are less certain — developer.ebay.com pages repeatedly failed to load during research, so those values come from documented Platform Notifications event types found via search rather than a directly confirmed doc page.