Sell more on Amazon, eBay, Temu, and Etsy. Listing optimization, fees, API integration, and growth guides for online marketplace sellers.
Showing 1 – 19 of 19 articles
Allegro API integration explained: OAuth2 flows, token lifetimes, product offers, stock sync, order event polling, rate limits and the traps to avoid.
bol.com API integration, checked against the official docs: 299-second tokens, v10 vs v11 headers, rate limits, process statuses and a working Python client.
Mirakl API integration for sellers: authentication, product and offer imports, stock and price sync, the order workflow and the official rate limits.
Zalando Partner API (zDirect) explained: OAuth token flow, endpoint map, product onboarding, price and stock batching, order flow and real rate limits.
DATA_ERROR, SYSTEM_ERROR, TIMEOUT_ERROR explained: how to pull Walmart item-level ingestion errors, which to retry, and why PROCESSED feeds still fail.
How the SP-API restricted data token works: which operations need an RDT, the dataElements and roles that unlock PII, and how to cache RDTs safely.
Walmart WFS API integration mapped endpoint by endpoint: item conversion, inbound shipments, WFS orders, inventory limits and the traps that break syncs.
How WooCommerce Amazon integration really works: SP-API sync limits, ASIN and GTIN traps, Codisto's closed plugin, and 8 checks before you buy one.
Shopify Walmart integration three ways: Marketplace Connect, a third-party app, or a custom API build. Real fees, feed rate limits, and where each one breaks.
How Shopee Open Platform API v2 integration works: app categories, OAuth flow, HMAC-SHA256 signing, token refresh, sandbox, IP whitelist and key rotation.
SHEIN seller API integration explained: the tempToken to openKeyId flow, request signing with code, secretKey decryption and order sync design.
What an eBay API integration service should cover: OAuth, Inventory and Fulfillment APIs, call limits, EU/UK signatures and the Trading API calls being retired.
Temu seller API integration explained: authorize a shop, pick the right regional host, sign requests with MD5, sync orders and stock, and handle webhooks.
What an Etsy API integration service covers, which Etsy API access tier you need, plus OAuth, webhooks, rate limits and what to ask before you hire.
Walmart Marketplace API integration explained: OAuth 2.0, rate limits, item spec 5.0 feeds, inventory, orders and sandbox testing, with working code.
Amazon SP-API integration cost in 2026: Amazon cancelled its API fees, so your price is scope, compliance and upkeep. See what really drives a quote.
Hiring an Amazon SP-API developer? Check who owns the developer account, which APIs Amazon is retiring, and the questions that expose weak candidates.
Fees for Amazon sellers in 2026: referral, FBA, storage and the new 3.5% fuel surcharge, plus the math to find your real net per sale.
eBay seller fees in 2026: the 13.6% final value fee, the fee base that makes it higher, category rates, store maths and the UK zero-fee rule explained.
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