These weaknesses have been addressed in the TLS 1.2 version. Security research published in recent years demonstrated that TLS version 1.0 and 1.1 contained weaknesses that limited its ability to protect and secure communications. In advance of the changes to production, TLS version 1.0 and 1.1 support will be discontinued in the lower Web Tools environments and available for testing on 5/22/18: ). Integrators are encouraged to update to at least TLS 1.2 to avoid connection issues. After this change, integrations leveraging TLS version 1.0 and 1.1 will fail when attempting to access the APIs. This includes, but is not limited to, all shipping label and package pickup APIs. Effective 06/22/18, Web Tools will discontinue support of Transport Layer Security (TLS) version 1.0 and 1.1 for securing connections to our HTTPS APIs through the following URL. This message explains some security improvements planned for our services. If you have any other questions, please don't hesitate to contact us at and we will be happy to help you in anyway that we can. If you are hosting with a reseller, you should check with them to see if their servers are updated to support a technology called TLS 1.2. If you are hosting your shopping cart directly with Cart32, then this will not be an issue. USPS is updating the security on their servers, which means some older web servers will not be able to contact USPS to get rates in the near future. These lists are not exhaustive and being listed is not an endorsement by USPS.If you use USPS to calculate your shipping rates in Cart32 inside of Cart32, they may stop working if your web server is not set up correctly. To assist companies that need help integrating USPS Web Tools into their sites, the Postal Service ™ publishes contact information for some companies willing to provide services that meet our criteria. ![]() Contact the Internet Customer Care Center with the following information: For access to more secure APIs, like Label Printing, you’ll need additional permissions. You’ll then have access to the most popular APIs. Once registered, you’ll receive an email with your assigned Web Tools User ID. Get access to our Web Tools through a simple registration process. USPS Web Tools are ecommerce application program interfaces (APIs) that can be used for online stores or customer service centers-free of charge. Try the Domestic Rate API below or jump into the technical documentation and start developing. Experiment with Web Tools and change some of the values of the XML tagsĬalculate postage rates quickly and easily online for domestic and international shipping.Hit enter to make the call and receive a response in your browser.Select the entire XML code below and paste it into the search bar of your browser.Insert today's date into the value of the "ShipDate" tag (if applicable). ![]()
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