UPS Missing or invalid shipper number error (120100)

Follow this guide to add your UPS shipper number (account number) to your ups.com profile. This should solve the UPS error `120100: Missing or invalid shipper number error` when using UPS shipping API or Postmen labels API.

Add UPS shipper number to ups.com

  1. Log in to ups.com (Be sure to use the same User ID and Password that is in your Shipping API)
  2. Select Account Summary from the My UPS tab rollover menu.
  3. Verify your account is listed; if not, select the Add a UPS Account link
  4. Follow the instructions to add the account
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