This guide is for new customers who have received a unique promo code from their USPS representative and have not yet linked their NSA rates to ShipStation.
For an overview of how Negotiated Service Agreement (NSA) customers use a USPS Enterprise Payment Account (EPA) with a ShipStation account , see our USPS Business Portal & Enterprise Payment Account (EPA) page.
Already have a USPS Business Portal and NSA Rates? See our page for Existing Customers: Link Your USPS Negotiated Service Agreement (NSA) Account.
To access your specialized USPS Negotiated Service Agreement (NSA) rates within ShipStation, you must complete the mandatory Customer Onboarding Portal (COP) flow. This process links your USPS Enterprise Payment Account (EPA) and your contract rates directly to your ShipStation account via Stamps.com.
Be sure you have received the following four pieces of information from your USPS sales representative:
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Promo Code: Required to create your new Stamps.com account.
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CRID (Customer Registration ID): Required for final setup.
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MID (Mailer ID): Required for final setup.
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EPS (Enterprise Payment System) Number: Required for final setup.
Before beginning the COP process, you must establish your new ShipStation account and ShipStation Balance payment method:
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Register: Go to ShipStation.com and create your new account using the promo code your USPS representative provided you.
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Verify Your Account: Complete the mandatory email and phone verification steps. Note that the USPS connection prompts will not appear until these verifications are finalized.
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Set Up Your ShipStation Balance: Add a valid payment method to your ShipStation Balance.
Once your account is verified and your ShipStation Balance is set up, a connection-prompt pop-up titled Connect your USPS business account will appear automatically on your dashboard:
Setup Progress Will Persist
If you log out before completing the setup, this pop-up will repopulate the next time you log in.
Dashboard Banner: A banner titled Connect your USPS business account to Stamps.com to access NSA rates will also persist at the top of your screen. This banner will remain visible throughout the app until the process is finished.
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To begin, click See Instructions.
Clicking See Instructions from either the pop-up or the banner will open a new browser tab to the Stamps.com guidelines.
Automatic Login: You will be automatically authenticated into the Stamps.com interface based on your active ShipStation session. No additional login is required.
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Follow the on-screen prompts and complete the flow within the Stamps.com tab to finalize your Customer Onboarding Portal steps.
Follow these steps to set up your USPS Business Account and EPA.
Already have a USPS Business Account AND a linked EPA?
If you already have a USPS Business Account AND a linked EPA, you may skip to Step 4. However, if you have an account but no EPA, you must follow these steps to add one.
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Click the link labeled Setup your USPS business account In the New to USPS? section of the guidelines.
A new browser tab will open to the USPS login page.
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If you need an account: Click Create New Account, validate your email, and complete the three-step setup wizard.
If you have an account: Sign in with your existing credentials.
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Locate the section Add your payment account to get started once you land on your Business Portal dashboard.
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Check the box that reads, "I have read, understand and agree to the payment account terms and conditions", then select your payment method (Credit Card, ACH Debit), click Continue, and complete the required setup steps.
Mandatory Connection Requirement
While the UI may suggest this step is optional, it is mandatory to complete the connection to Stamps.com. Do not skip this step!
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Return to the original Stamps.com browser tab to continue, once your payment method is successfully added (it may show as Pending for ACH).
ACH Bank Account Verification (Micro-Debits)
To verify the payment account being added, two micro debits (less than $1.00) will be made to the bank account within 24 to 48 hours. Monitor bank accounts and note the amounts, as they will be needed to verify the account.
Once you have the two values from your bank account, log back in to the USPS Business Portal and verify those entries. If needed, you can go to My Account and click the link under the Payment Account.
With your USPS Business Account and EPA established, you can now link them to Stamps.com.
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Click Link your business account in the Finalize Your Connection section of the guidelines.
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Sign in to your USPS.com account and complete the Multi-Factor Authentication (MFA) flow as prompted.
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Check the agreement box and click Authorize and Continue on the Grant Auctane Access screen.
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Click the large Go to Auctane button to finalize the link on the Successful Integration screen.
You will be redirected back to the Stamps.com interface to complete the final step: Input your CRID, MID, and EPS IDs.
Once you have finished the process in the Stamps.com tab, you will see a confirmation banner in Stamps.com that reads, USPS business account approval is pending.
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Refresh ShipStation: Return to your ShipStation browser tab and refresh the page.
A new status banner will appear in ShipStation reading, "Please wait for approval from USPS to begin printing with NSA rates."
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Contact your USPS sales representative to confirm that your EPA and contract are successfully linked.
Dashboard Banner Persistence
This banner will persist on your ShipStation dashboard until you manually dismiss it. Once dismissed, it will not appear again.