Due to changes in the USPS Business Account platform, all customers using Stamps.com must now grant Auctane permission to maintain their Negotiated Service Agreement (NSA) rates.
To access these specialized rates, you must complete a mandatory onboarding process through the USPS Customer Onboarding Portal (COP). This will link your To access these specialized rates, you must complete a mandatory onboarding process through the USPS Customer Onboarding Portal (COP). This will link your USPS Enterprise Payment Account (EPA) and contract rates directly to your Stamps.com account. and contract rates directly to your Stamps.com account.
For an overview of how Negotiated Service Agreement (NSA) customers use a USPS Enterprise Payment Account (EPA) with a ShipStation API account, see our USPS Business Portal & Enterprise Payment Account (EPA) page.
This guide covers the process for new Stamps.com customers, including those who do not yet have a USPS Business Account or those who have an account but have not yet established a payment method (EPA).
Already have a USPS Business Portal and NSA Rates? See our page for : Link Your USPS Negotiated Service Agreement (NSA) Account to Stamps: .
Required EPA Setup for USPS NSA Accounts
Even if you already have an existing USPS Business Account, you must ensure your EPA is established before finalizing your connection. Skipping the EPA setup in Step 3 will cause errors when attempting to link your account to Stamps.com in Step 4.
Be sure you have received the following four pieces of information from your USPS sales representative:
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USPS NSA 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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EPA (Enterprise Payment Account) Number: Required for final setup.
Warning: Reset Password as Last Resort
Resetting your password will immediately break all active connections, including partner platforms, 3PL systems, and custom integrations. Only reset if absolutely necessary, as you must manually update your credentials across every connected system to avoid label printing errors.
Please note that for security reasons, Support cannot retrieve or provide existing passwords.
Follow these steps to create and register your Stamps.com account.
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Go to Stamps.com. and click Get Started to create and register a new account.
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Follow the account creation steps, ensuring you enter the USPS NSA Promo Code provided by your USPS sales representative.
USPS NSA Promo Code Required
To properly set up this account type and get your Negotiated Rates, it is essential to enter the USPS NSA Promo Code that your USPS sales representative provided you.
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Log in to your newly created ShipStation API account.
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Choose one of two ways to connect.
When you first log in, you will be prompted to connect your account through one of two ways:
Connection Pop-up: Click See Guidelines to begin from the pop-up titled Connect Your USPS Business Account that will appear.
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Dashboard Banner: Click See Guidelines within the persistent banner that reads, Connect your USPS Business Account to Stamps.com to access NSA rates. This banner will remain at the top of your dashboard.
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 USPS.com 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 (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).
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 next to I have read, understand, and agree to the USPS Terms and Conditions for authorizing Auctane to access my USPS business account, 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.
