TL;DR: Brand-authorization letters prove you're sourcing from an authorized channel — not a gray-market aggregator. For international buyers, they reduce customs scrutiny at entry and satisfy online marketplace (Amazon, Walmart) authorization checks for resale. Catalist provides authorization letters on request because we source brand-direct.
The Authorization Evidence
- Catalist sourcing model
- Brand-direct through authorized channels — not a gray-market aggregator
- Brand-authorization letter
- Available on request at no additional cost
- Typical letter content
- Manufacturer name, authorized channel confirmation, date range of authorization, itemized products if requested
- Customs use
- Reduces gray-market flagging risk at destination customs
- Marketplace use
- Satisfies Amazon, Walmart, and eBay brand-gating documentation
- Dual-purpose parallel
- The same authorization document solves both customs clearance AND marketplace resale authorization
Why brand authorization matters for export resellers
Customs authorities and online marketplaces share one concern when goods move across borders: is the seller in the legitimate chain of custody, or is this a gray-market shipment that bypassed the brand's authorized channels?
Gray-market goods — genuine products routed outside the manufacturer's approved reseller network — create problems at both ends of the transaction. At destination customs, they trigger additional scrutiny because authorities cannot verify warranty coverage, safety recalls, or country-specific labeling compliance. At the online marketplace level, brand owners flag unauthorized listings and trigger takedowns that suspend the seller's account.
A brand-authorization letter resolves both concerns with a single document. The letter, signed by the manufacturer, confirms the reseller is operating inside the authorized channel. Customs can verify the claim by contacting the brand representative on the letterhead. Marketplaces can verify the claim the same way during brand-gating review.
For international buyers importing US brands to resell overseas — either through physical retail or through Amazon, Walmart, or eBay in the destination country — the authorization letter is the document that separates a fast, clean import from a three-week customs hold followed by a marketplace account suspension.
How authorization letters prevent gray-market flagging at customs
Destination customs officers look at three signals when deciding whether a commercial shipment needs additional review: the commercial invoice (does the named manufacturer match the goods?), the country of origin (does it match the manufacturer's known production?), and the channel of custody (did this reach the importer through an authorized reseller?).
The first two come from the commercial invoice. The third is where a brand-authorization letter matters. Without one, customs has no independent confirmation that the named reseller is actually in the brand's approved network. A letter on brand letterhead, signed by a manufacturer representative, gives customs that confirmation in a single page.
The practical impact at destination ports: shipments with an authorization letter in the document pouch typically clear baseline commercial-goods review in 1-3 business days after vessel arrival. Shipments without one, where customs has questions about channel legitimacy, can sit in secondary review for 5-15 business days while officers contact the brand directly for verification.
For high-value shipments — single pallets above roughly $25,000 invoice value — having the letter pre-attached to the commercial invoice is the difference between predictable clearance timing and a customs hold that ripples through the whole downstream sell-through calendar.
Catalist's brand-direct relationships — what authorization actually means
A brand-authorization letter is only worth as much as the sourcing relationship behind it. A reseller buying stock off a liquidation pallet cannot produce a real authorization letter because no brand signed one. A reseller sourcing brand-direct can.
Catalist's platform runs on direct relationships with the US manufacturers whose brands appear in buyer orders. Stock moves from the brand to our Brooklyn, NY warehouse through approved channels, which means the authorization extends cleanly to buyers sourcing through us.
When a buyer requests an authorization letter, we coordinate with the brand's account manager to issue the letter on brand letterhead, signed by a brand representative, covering the specific time window and product list relevant to that buyer's order. The letter is not a Catalist-generated document with a brand logo pasted on — it is a manufacturer-issued document that names Catalist as the authorized channel and the buyer as the end destination where applicable.
This matters specifically for export buyers who resell to end consumers in regulated categories (cosmetics, small electronics, health products). Customs and marketplaces in those categories reject resellers who cannot produce manufacturer-signed authorization, and accept the letter as the strongest available proof when it is manufacturer-issued.
Parallel to Amazon ungating documentation
The strongest argument for requesting an authorization letter is that it does double duty. The same document that resolves a customs question at the destination port also satisfies online marketplace brand-gating review — the process where Amazon, Walmart, and eBay ask sellers to prove they are authorized to list a specific brand.
Marketplace brand-gating asks for the same evidence customs asks for: a manufacturer-signed letter confirming the seller is in the authorized channel, plus commercial invoices showing the goods actually moved through that channel. Both documents come from the same Catalist order: the commercial invoice is automatic; the authorization letter is the on-request companion.
For international buyers who list on the destination country's Amazon or Walmart storefront (Amazon.ca, Amazon.co.uk, Amazon.com.au, Amazon.de), the marketplace review is conducted in the destination country's language but asks for the same document set. The manufacturer letterhead works across all destinations because it originates in the US regardless of where the listing appears.
This is the practical reason to source through an authorized channel: one documentation package, two use cases, no duplicated effort. See brand-specific Amazon authorization guides for category-level detail on what each brand's gating review requires.
Requesting authorization letters through Catalist
The request process is intentionally direct. Email orders@catalistai.com with four pieces of information:
- Your order number. This anchors the letter to a specific shipment and lets us confirm which brands are in scope.
- Destination country. Some brands phrase letters differently for EU vs. UK vs. Canada vs. Australia recipients, and this lets the brand tailor the language correctly.
- Intended use. Whether the letter is for customs clearance, online marketplace gating, or both. This changes whether we request product itemization on the letter and how the brand phrases the authorization scope.
- Specific brands needed. If your order contains 20 brands but you only need letters for 3, list those. Some brands take longer to coordinate than others, and filtering the request up front avoids unnecessary delay.
Typical turnaround is within 5 business days, measured from request receipt to PDF delivery by email. The letter is issued by the brand on brand letterhead, signed by a brand representative, with contact information that allows customs officers or marketplace reviewers to verify the document directly with the manufacturer.
There is no additional cost for authorization letters on Catalist orders. The request flow is designed to make the document available when it matters — high-value shipments, regulated categories, or marketplace resale plans — without adding it to every order where it would just be extra paperwork the buyer does not need.
Related reading
Frequently Asked Questions
Start sourcing US brands with authorization documentation
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