Ecommerce Marketplace Launch Checklist
The full sequence from product identifiers to marketplace payout, in the order a real listing needs them. It matches our Ecommerce Toolkit workflow, plus the pricing and shipping calculators that pick up where the toolkit leaves off.
14 items · 3 min read ·
Product identifiers
Generate a stable SKU your own systems can track
Settle this before you build out variants. Changing an identifier after a listing is live usually means resubmitting it for review.
Generate or validate the GTIN/EAN/UPC your marketplace requires
Standard GS1/ISO formats, accepted by every marketplace. Only use one on a real product if you hold a licensed GS1 prefix.
For books or media, validate ISBN-10/ISBN-13 or Amazon ASIN format
Check digits and format, not just presence of a number.
Labels & images
Generate a scannable barcode for the physical product or shipping carton
Warehouse and fulfilment-centre staff scan the label, not the number printed next to it.
Every product image checked against the target marketplace's dimension, aspect-ratio and file-size rules
Amazon, eBay and Shopify each enforce their own rules. One undersized image is enough to get an otherwise perfect listing flagged.
Catalog validation
Run the full product CSV through a validator before uploading
Most listing rejections happen at the CSV upload step, well before manual review. A missing column or one malformed barcode can fail an entire batch.
Confirm no duplicate SKUs or broken variant handles in the file
Catch it before you upload, not after a rejection notice.
Pricing & tax
Work out margin and markup from cost and selling price before setting the listing price
Margin (on selling price) and markup (on cost) are two different numbers off the same inputs. Know which one you are targeting.
Roll shipping, customs duty and per-unit fees into a true landed cost
Product cost alone understates what an item costs you to sell.
Calculate GST on the final price: CGST/SGST for intra-state, IGST for inter-state supply
Confirm which slab applies to the product's HSN/SAC classification first.
Check the net payout after marketplace commission, gateway, and shipping fees, not just the sticker price
Commission rates are set per marketplace, per category, and sometimes per seller tier.
Shipping & fulfilment
Confirm chargeable weight (actual vs volumetric) against your courier's rate card before pricing shipping in
A large, light package can cost more to ship than a small, heavy one once volumetric weight applies.
Know your own COD RTO rate and the true cost of a single return before committing to a COD price point
A returned COD order already cost you the forward shipping fee before it came back. None of that is refunded.
Banking & test data
Use format-valid, checksum-correct test IBANs when testing a payment or payout integration
Never a real account number. Test data only, clearly generated as such.
Tools For This Checklist
SKU Generator
Generate consistent SKU codes in bulk from a custom pattern with variant permutations, sequential numbering and collision checking.
GTIN Converter
Convert product codes between GTIN-8, GTIN-12 (UPC-A), GTIN-13 (EAN-13) and GTIN-14, validate check digits, and normalise a whole catalog in bulk.
EAN / UPC Generator
Generate valid-checksum EAN-13, EAN-8, UPC-A and GTIN-14 product codes in bulk for test catalogs, and validate the check digit of any existing code.
Barcode Generator
Render a scannable EAN-13, UPC-A, CODE128 or ITF-14 barcode from a product code and download it as a PNG for labels and store listings.
Marketplace Image Checker
Check product images against each marketplace's dimension, aspect ratio, file size and format rules before you upload them.
Product CSV Validator
Check a product CSV for missing columns, broken variant handles, duplicate SKUs, invalid barcodes and bad prices before you import it.
ISBN / ASIN Validator
Validate ISBN-10 and ISBN-13 check digits, convert between them, and check Amazon ASIN format in bulk.
Profit Margin Calculator
Work out margin and markup from cost and selling price, roll shipping and duty into a per-unit landed cost, or back into the price a target margin needs.
Discount Calculator
Work out stacked/sequential discounts, a Buy-X-Get-Y-free offer's real effective discount, and whether a bundle price beats buying items individually.
GST Calculator
Add or remove GST at any standard slab rate, split into CGST/SGST for intra-state supply or IGST for inter-state supply.
Shipping Cost Calculator
Work out volumetric vs actual chargeable weight and the total shipping cost from your own courier's rate card, including fuel surcharge and COD fees.
COD & RTO Cost Calculator
Work out your own RTO rate, what a single return-to-origin actually costs, and how COD's net revenue per order compares to a discounted prepaid option.
Marketplace Fee Calculator
Enter your marketplace's commission, payment gateway, and shipping fees to see the real net payout and margin behind a listing price.
IBAN Generator
Generate format-valid, checksum-correct IBAN numbers for any supported country for testing and QA, and validate the checksum of any IBAN.