I have a little problem with integrating the USPS web tool to my opencart and I need you advice. I registered an USPS web tool API user ID first, and I got an email stats that I need to send calls to the test server with my user ID. Here is the original email from USPS:
Your Web Tools User ID, shown above, is required to test and integrate USPS Web Tools APIs. With this ID, you may begin sending calls to the test server. Depending on the API, the address to the test server is either http://production.shippingapis.com/ShippingAPITest.dll or https://secure.shippingapis.com/ShippingAPITest.dll. Use this information in combination with your User ID and your XML string to send a request to the USPS servers. For more details, refer to the programming guides (located at http://www.usps.com/webtools) for the specific API you are integrating.
A sample test request would look like: "http://production.shippingapis.com/Ship ... ng_User_ID]"
However, I am not sure how can I send this string to the USPS, can anyone share your experience with me? Thanks in advance!
