What retailers publish they charge vendors for compliance failures — 338 published fees across 14 retailers, each quoted from the retailer's own public document. Whether a given fee is enforced on a given shipment is between you and your buyer.
Walmart, Target and Amazon put their vendor requirements behind supplier logins, so there is no public document to quote. Nothing here was taken from a login-gated portal.
Their fee schedules are not published anywhere, so they can only be learned from chargebacks suppliers actually receive. That may never be something we can cover — leave an email and you'll hear if it changes.
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