Crosslist from BigCommerce to Amazon — GTINs, Categories and Sync

On this page

• Why crosslist from BigCommerce to Amazon
• The GTIN requirement and what BigCommerce holds
• Which categories Amazon allows
• How BigCommerce variants map to Amazon
• What transfers, field by field
• What syncs and what does not
• Before and after: the BigCommerce-to-Amazon workflow
• Automation on both channels
• What it costs
• Sources and verification
• Related guides

Why Crosslist from BigCommerce to Amazon

A BigCommerce store is your own catalogue. You own the product data, the customer relationships, and the ability to sell through multiple channels at once. Amazon is the world’s largest marketplace by volume: over $575 billion in annual revenue across all categories, with millions of active buyers shopping by category rather than by brand.

Running both means reaching buyers in two fundamentally different places. A customer searching for a specific product type on Amazon will never see your BigCommerce store unless you list there. The reverse holds for someone navigating directly to your storefront. A mid-market seller with hundreds of products can reach three to four times as many potential buyers by listing both, because the audiences overlap far less than most sellers expect.

The GTIN Requirement and What BigCommerce Holds

Amazon does not let you create a product page from scratch the way BigCommerce does. Instead, you attach an offer to an existing product in its catalogue. That product is identified by an ASIN (a ten-character Amazon code) or by a barcode: an EAN, UPC, GTIN or ISBN. Without one of these, Amazon will reject the listing as unresolvable.

This is the single biggest filter between a BigCommerce catalogue and what can actually crosslist to Amazon. Unlike marketplace sellers (who have never been asked for a barcode), you have likely already captured these fields: BigCommerce’s product form includes dedicated fields for UPC, EAN, ISBN and GTIN, visible under the Inventory tab. But in practice, many sellers leave them blank.

Three scenarios play out:

Scenario one: the barcode is already recorded. Books, vinyl, games, packaged goods—anything with a manufacturer’s barcode on the physical item—often arrives in BigCommerce already captured. Scan it in, or look it up from your supplier. FLUF sends it to Amazon, Amazon resolves it, and the listing goes live on the existing product page. This is the path with no extra work.

Scenario two: you have the item but not the barcode record. For own-brand stock, or for items you source without barcodes, Amazon’s product ID exemption exists. You click “I don’t have a product ID” in the listing flow, submit images of the product and packaging, and Amazon approves or rejects the application in roughly 48 hours. Approvals are per category and per marketplace, and once you mark a product as generic, that designation cannot be reversed.

Scenario three: it is not a manufactured good. If you sell custom items, one-offs, or bundles with no manufacturer barcode, the exemption route is available to you, but crosslisting will always be manual—there is no batch tool for generic goods. That is not a limitation of FLUF; it is a constraint Amazon enforces.

Before you build anything, audit your BigCommerce catalogue. Filter products by “has UPC” or “has GTIN”. That population is what can crosslist today with no extra work. Anything without an identifier needs either the barcode on hand or an exemption application.

Which Categories Amazon Allows

Beyond the GTIN requirement, Amazon imposes a condition gate on whole categories. Amazon’s UK Condition Guidelines (PDF) explicitly forbid used goods in: Apparel, Shoes and Bags, Sports, Baby, Pet, Grocery, and everything consumable (Beauty, Food, Health & Vitamins, Supplements, Ingestible Products).

If you are a used-fashion seller, that list describes your entire business. In that case, Amazon is not an option.

Beyond that explicit list, many categories require pre-approval to list used goods. The symptom is silent: when you try to create a listing in one of these categories, the “used” condition option simply does not appear, with no error explaining why. Ink and toner is a known example: used is permitted only with seller support approval.

Check your top 20 categories against Amazon’s guidelines before importing anything. If they are all in the restricted list, you have your answer. If they are mixed, plan to partition your catalogue and crosslist only the eligible half. Sellers of used fashion should focus on Vinted, Depop and Vestiaire Collective instead.

How BigCommerce Variants Map to Amazon

This is where a store platform and a catalogue diverge most sharply. On BigCommerce, you create one product with variants—say, a shirt in four sizes and three colours, which is twelve sellable options hanging off a single admin entry. That structure is a convenience for you.

Amazon has no parent–child variant concept. It treats each distinct thing a buyer can purchase as its own catalogue entry with its own ASIN or GTIN. A twelve-variant shirt is twelve ASINs, or twelve GTINs, or it is not crosslisting.

The practical implication depends on how your variants are identified:

If your manufacturer issued a barcode per variant (normal for apparel and packaged goods): you already have what you need. BigCommerce lets you enter variant-level GTINs—each size and colour combo gets its own barcode on the product form. Make sure each variant’s GTIN field is filled in. FLUF will send each one separately to Amazon, and each will resolve to its own product page.

If you assigned one barcode to the parent product and left variants empty: every variant will try to resolve to the same Amazon entry, which is wrong and will eventually ship the wrong size to a customer. If your variants do not each carry their own unique identifier, they cannot crosslist as a group. Options: either obtain variant-level barcodes from your supplier, or list them one at a time by hand on Amazon and have FLUF keep stock in sync afterwards.

If your variants are things a manufacturer never barcoded (a custom length, a personalisation option, a handmade variation): there is no clean Amazon mapping. Keep those on BigCommerce and on channels that model variants properly, like Shopify or Etsy.

What Transfers, Field by Field

When you crosslist a BigCommerce product to Amazon, some fields travel automatically, some are matched to Amazon’s own fields, and some need your attention.

The most important mechanical detail: images are sent as URLs, not uploaded as files. Your BigCommerce image URLs must be publicly reachable—if they sit behind a login or maintenance-mode plugin, Amazon fetches nothing and the listing appears without photographs. That is worse than a rejection because it publishes broken.

Price and stock updates are sent as patches rather than replacements. Anything you adjust by hand in Seller Central survives a price change pushed from BigCommerce; FLUF does not wipe your edits.

What Syncs and What Does Not

The entire point of running both channels is that one physical item is never promised twice. Here is the exact scope of how that works today.

Works. An item sells on BigCommerce, or on any other channel you have connected, and your Amazon quantity goes to zero automatically. You can update price and stock from BigCommerce and the changes push to Amazon. Listings can be removed.

Does not work yet. An item sells on Amazon and nothing happens in BigCommerce. FLUF does not yet detect Amazon sales. An order on Amazon will appear in Seller Central and nowhere else. Your BigCommerce stock count stays where it was. Mark items sold in FLUF when you see them move in Seller Central.

Before and After: The BigCommerce-to-Amazon Workflow

This is what changes when FLUF is in the middle.

Without FLUF Connect (Manual Crosslisting)

1. Open Seller Central, click Create Listing
2. Search for the product by GTIN or ASIN to find the catalogue entry
3. If no match, either apply for a product ID exemption or find a similar entry
4. Choose the offer condition from Amazon’s scale (many BigCommerce conditions do not map directly)
5. Enter your price
6. Paste in a description (BigCommerce text, edited for 2,000-character limit)
7. Set quantity
8. Publish
9. Repeat for each product (scale this to hundreds or thousands of items and you are looking at dozens of hours)
10. Maintain a spreadsheet tracking which BigCommerce items are live on Amazon
11. When an Amazon order arrives, go to Seller Central, note the quantity sold, then go back to BigCommerce and adjust stock
12. When a BigCommerce sale happens, manually go to Seller Central and zero the Amazon quantity

Time per item: 3–5 minutes. For a typical inventory: 25–40 hours of manual work.

With FLUF Connect

1. Ensure your BigCommerce product GTINs are filled in (or apply for exemptions)
2. Connect BigCommerce in FLUF
3. Connect Amazon
4. Select products to crosslist
5. Review the listing details
6. Click Crosslist
7. Once Amazon accepts the listing, inventory syncs automatically

Time per item: 30 seconds. For a typical inventory: ~4 hours of work, mostly clicking.

What FLUF automates on this route: FLUF reads your BigCommerce catalogue (SKUs, prices, stock, condition, GTIN), publishes to Amazon in bulk, and keeps inventory in sync. When a sale happens on BigCommerce, FLUF zeros your Amazon stock. You still monitor Amazon separately for sales, because FLUF does not yet pull Amazon orders back into BigCommerce.

Automation on Both Channels

This pair routes through platforms with very different automation capabilities.

BigCommerce side: Crosslisting, inventory sync, and order sync are all supported. You can set rules to auto-crosslist new products to Amazon, filter by category or price, and bulk-adjust prices across both channels at once.

Amazon side: Amazon does not support any of FLUF’s automation features. There is no relisting, no offer management, no smart pricing. Repricing is manual—you adjust your price in Seller Central or via the FLUF interface, but you are not competing algorithmically against the other offers on that product page. That is a real limitation if you rely on dynamic repricing. It is worth weighing before you commit a large catalogue.

What It Costs

7 days for £1, then from £9/month, then plans from £9/month.

Crosslisting, inventory sync, order sync and bulk operations are included on every plan. Relisting, offer management and smart pricing come with the plans above Starter. Since neither BigCommerce nor Amazon supports relisting or smart pricing today, the tier decision is mostly about product volume and support priority.

On top of FLUF’s fees, Amazon charges £25/month (UK Professional plan) or $39.99/month (US), plus a referral fee on each sale ranging from 5% to 45% depending on category.

BigCommerce fees are separate again: your monthly store subscription to BigCommerce, plus payment-processor fees.

Sources and Verification

Every fact was checked against a primary source on 11 September 2026.

• BigCommerce product fields reference — the UPC, EAN, ISBN and GTIN fields on the Inventory tab
• Amazon UK Condition Guidelines (PDF) — the explicit New-only restriction on Apparel, Shoes and Bags, Sports, Baby, Pet, Grocery and consumables; approval requirement for other categories
• Amazon’s product ID exemption documentation — the application flow, 48-hour approval, per-category and per-store scope, and irreversibility of generic designation
• Amazon UK Professional plan pricing — £25/month and referral fee ranges
• Amazon US Professional plan pricing — $39.99/month and referral fee ranges
• BigCommerce inventory tracking documentation — variant-level inventory and the variant structure

What we could not verify, and therefore left out. The proportion of a typical BigCommerce catalogue that carries complete GTINs — no survey exists, and it varies wildly by merchant category and supplier. The exact percentage of Amazon categories that are gated or allow used goods — Amazon publishes a New-only list but the complete gated-category list sits behind a Seller Central login. Whether BigCommerce’s native Amazon Channel Manager (separate from FLUF) would be preferable for a given seller — the comparison depends entirely on that seller’s size and automation appetite, and we describe the FLUF route rather than ranking tools. The acceptance rate of FLUF’s Amazon attribute maps for different product types — that cannot be known until real sellers have pushed real stock through them.

Related Guides

• Sell on BigCommerce — the complete store guide
• Sell on Amazon — the complete seller guide
• Sell on WooCommerce — the WordPress seller guide
• Crosslist from WooCommerce to Amazon
• Crosslist from Shopify to Amazon
• All marketplace guides
• All crosslisting routes
• BigCommerce vs Amazon