How to Change Your Seller Order ID in Amazon Seller Central
Amazon lets sellers add a custom Seller Order ID of up to 50 alphanumeric characters when confirming shipment. The ID can be entered per order or bulk‑uploaded via the Order Feed API or a flat‑file, and it stays editable until the order status changes to Shipped.
Amazon automatically generates a unique order number for every purchase, but sellers can also attach their own identifier to each order. This custom “Seller Order ID” can be entered when confirming shipment and is especially valuable for merchants who need to match Amazon sales with external invoicing, warehouse, or accounting systems. Using a parallel ID helps keep records consistent across multiple sales channels and reduces manual reconciliation effort.
Key Points
Optional parallel identifier — Amazon always creates its own order number, yet sellers may add a second ID for internal tracking without affecting the original number.
50‑character limit — The custom field accepts up to 50 alphanumeric characters, which accommodates most SKU‑based, date‑coded, or sequential schemes.
Entered at shipment confirmation — The Seller Order ID is supplied during the normal “Confirm shipment” step, so it becomes part of the fulfillment feed automatically.
Bulk updates via feeds — High‑volume sellers can push IDs for many orders at once using the Order Feed API or by uploading a flat‑file, streamlining large‑scale changes.
Alphanumeric only — The system rejects symbols such as “#”, “/”, or “%”; only letters (A‑Z) and numbers (0‑9) are permitted.
Channel‑prefix recommendation — Adding a short prefix like “AMZ‑” or “AZ‑” makes Amazon orders instantly recognizable when aggregated with eBay, Walmart, or Shopify data.
Editable after confirmation — Sellers can modify the custom ID up to the point the order status changes to “Shipped,” allowing a brief window for corrections.
Visible in reports — Once saved, the Seller Order ID appears in order‑level reports, inventory dashboards, and the shipment confirmation file, giving downstream systems a single source of truth.
How Seller Order ID Works
Locate the order — In Seller Central, open the Orders tab and search by Amazon’s native order number.
Analysis & Recommendations
Why This Matters
Before using custom IDs, staff spent about 15 seconds per order manually cross‑referencing spreadsheets; after adding a Seller Order ID the same task drops to under 2 seconds, saving minutes per batch. The feature also ensures ERP and warehouse systems receive a single reference, reducing errors.
Key Takeaways
Seller Order ID accepts up to 50 alphanumeric characters; symbols like #, /, % are rejected.
IDs are entered during the Confirm shipment step or bulk‑uploaded via the Order Feed API or a tab‑delimited flat‑file.
The custom ID can be edited until the order status changes to Shipped, providing a correction window.
Adding a prefix such as "AMZ-" helps differentiate Amazon orders in multi‑channel reports.
Recommended Actions
→In Seller Central, go to Orders, open an order, click the Edit link next to Seller Order ID, enter a 50‑char alphanumeric ID, and save before confi...
→Create a nightly script that pulls recent Amazon order numbers via the SP‑API, generates IDs (e.g., "AMZ‑INV‑20240303‑001"), and submits them with ...
→Each morning, review the Feed Processing Report under Reports > Fulfillment > Feed Processing Report and correct any rejected rows.
Example: A seller finds order #112‑1234567‑1234567 placed on March 3, 2024.
Open the edit field — Within the order details page, the Seller Order ID line shows an Edit link; clicking it reveals a text box. Example: The seller clicks Edit and sees an empty field beside the label.
Enter the custom ID — Type a code that follows the seller’s internal convention, such as “INV‑20240303‑001”. The entry must stay under 50 characters and contain only letters and numbers. Example: After saving, the order page displays “INV‑20240303‑001” next to the Amazon order number.
Validate the entry — Amazon checks the format instantly; if prohibited characters are present, an error message appears prompting correction. Example: The seller accidentally includes a “#” and receives a “Invalid characters” warning, then removes it and resubmits.
Confirm shipment — When the seller marks the order as shipped, the custom ID is transmitted with the shipment confirmation feed, ensuring that warehouse or ERP systems receive the same reference. Example: The warehouse management software reads “INV‑20240303‑001” and automatically links the package to the corresponding invoice.
View in reports — After shipment, the Seller Order ID appears in the “Orders” report download and in any API response that includes order details. Example: The seller exports a CSV for the last week and sees both Amazon order numbers and the matching custom IDs side by side.
Bulk feed submission — For dozens or hundreds of orders, sellers prepare a tab‑delimited file containing Amazon order numbers and their corresponding custom IDs, then upload it via the Order Feed interface or call the SubmitFeed API. Example: A seller uploads a file with 250 rows; Amazon processes the updates within minutes, and the new IDs become visible instantly.
Monitor feed status — The feed processing report indicates success or failure for each row, allowing sellers to quickly address any rejected entries. Example: Two rows fail because they exceed the 50‑character limit; the seller trims the IDs and resubmits.
Context: Before vs. After Custom IDs
Before: Orders displayed only Amazon’s native number, forcing fulfillment staff to manually cross‑reference each sale with the ERP’s invoice number. Scenario: A team spends roughly 15 seconds per order searching a spreadsheet for the matching internal record.
After: The same order shows the seller‑provided ID that matches the ERP reference exactly, eliminating the manual lookup step. Scenario: Staff scan the order list, see “INV‑20240303‑001,” and complete processing in under 2 seconds, saving minutes per batch.
Seller Impact
Integrating Seller Order IDs creates a tighter link between Amazon sales and back‑office workflows, reducing errors and accelerating order processing. Sellers should take the following concrete steps:
Align ID format with internal systems — Adopt a naming convention that mirrors the pattern used in accounting or ERP software. Example: If invoices follow “INV‑YYYYMMDD‑###,” use the same structure for every Seller Order ID to ensure one‑to‑one mapping.
Automate generation and upload — Build a script or use middleware that extracts recent Amazon order numbers, creates matching internal IDs, and pushes them through the Order Feed API on a scheduled basis. Example: A nightly Python job pulls the last 1,000 orders, generates IDs like “AMZ‑INV‑20240303‑001,” and calls SubmitFeed, achieving full automation without manual entry.
Prefix IDs by sales channel — Add a short channel code (e.g., “AMZ‑”) to each custom ID so that multi‑marketplace reports can be filtered instantly. Example: An Amazon order receives “AMZ‑INV‑20240303‑001,” while a Shopify order uses “SHO‑INV‑20240303‑045,” enabling a single dashboard to separate the two streams.
Validate before submission — Implement a validation step that checks length and character set to prevent feed rejections. Example: The automation script flags any ID longer than 50 characters or containing prohibited symbols, prompting a correction before the feed is sent.
Review feed processing reports daily — Monitor the status file returned by Amazon to catch and resolve any failed updates within the same business day. Example: The seller’s operations manager receives an email summary showing two failed rows, corrects the IDs, and re‑uploads the corrected file before the next shift.
Source: sellercentral.amazon.com
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