Is stamps.com supported as a USPS shipper
I know that USPS is listed as a supported shipper. But I have a client who has a stamps.com account and wants to use them. I've looked through their site and they do have some API information under their developer support. I know they are NOT the USPS and are only vendors. But I thought I would ask if this has worked for anyone before I ask my client to setup an account at the USPS web site.