USPS will require the PASSWORD field sometime in 2024

[lat9]

From this (https://www.usps.com/business/web-to...ease-notes.pdf) USPS documentation:

Summary: Effective January 31, 2024, Web Tools will require the password be provided with the USERID in each label API XML request. Otherwise, an error will return. In TBD 2024, the password will be required for all API requests. Integrators are strongly encouraged to provide this information in advance of the change to avoid any service disruptions or integration issues. Contact webtools@usps.gov for any questions or concerns.

2. Summary: Effective TBD December 2023, API access and permissions will be added separately after registration. To obtain these permissions, contact webtools@usps.gov and provide in your request for access:

• Username/UserID (from the automated registration email):
• USPS Mailer ID (MID):
• Company Website:
  -Are you a shipper or software provider? Please provide details on how your business will use the
  APIs.
  -List of API(s) to which you would like access and expected volume (peak daily, weekly, monthly) – reference www.usps.com/webtools for a complete list of APIs

You'll need to request access to the RatesV4 and IntlV2 APIs.

Existing users note: You'll need to find you oldy-moldy email from USPS that includes that password. A forthcoming release of USPS will include a setting through which you can supply the password (which, for backward compatibility can be blank).