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Suppliers who list branded goods on WholesaleUp™ must be able to prove product authenticity on request. The platform accepts two standard forms of proof: • Sanitized invoice — an invoice from an authorized upstream source (brand, authorized distributor, or authorized wholesaler) that traces the stock back to the brand. Pricing and the supplier's own upstream source can be redacted to protect commercial terms; SKU, brand name, quantities, and the chain of ownership must remain visible. • Letter of Authorization (LOA) — a direct written authorization from the brand confirming the supplier is permitted to sell and distribute the branded stock. Carve-outs: • Brand Owners don't need an LOA — they authorize themselves by virtue of owning the brand. Their company registration plus the brand's trademark record is sufficient proof. • Manufacturers, Private Label / White Label, and Artisan / Maker sellers of unbranded or own-brand goods can substitute manufacturing paperwork (production invoices, component-sourcing records, factory certifications) in place of a sanitized invoice or LOA. See What supplier type should I choose? for supplier-type definitions. Proof is verified at listing review and can be requested again at any time if buyer enquiries or audit signals raise concerns; a 72-hour SLA applies to platform audit requests (per Terms of Use clause 3.7). If proof can't be produced within the window, the affected products are delisted immediately (directory-wide if the issue recurs), active enquiries are flagged to the buyer with a platform notice, the Verified badge is revoked, Supplier Pro members forfeit the prorated balance for the remainder of the billing period without refund, and rights-holder brands may be notified where a listing suggests trademark infringement or unauthorized distribution. See Proving authenticity as a supplier for the supplier-side workflow and redaction rules. Buyers: you can also ask any supplier for sanitized-invoice availability before placing a first order — it's expected and standard practice. See Spotting counterfeit goods for the buyer-side diligence checklist. Reselling on Amazon? The sanitized invoice / LOA above proves the supplier is an authorized source — the hardest box to tick for Amazon ungating. But Amazon's review team wants a different document: your own purchase invoice from that supplier, unredacted, showing ≥10 units, your Seller Central business name and address on "Bill to", and a date within the last 90–180 days. Sanitization capability is a strong predictor the invoice you receive will clear Amazon, but confirm at order time that the supplier will issue it unredacted — Amazon doesn't accept price-redacted invoices. See Amazon ungating with WholesaleUp™ suppliers and Amazon ungating invoice requirements for the full buyer-side checklist.