Actually USPS doesn't expose any API that allow the deduction of postage directly from USPS. I have checked it many times with USPS otherwise I would have implemented it. They asked me to use any of their partner i.e. Endicia or stamps.com. This is the reason that all available 3party software which deduct postage either use endicia or stamps.
Any new info on this? I have a couple people who really want to incorporate Endicia with their cart to take the work out of manually going the USPS site and doing the postage. I'm looking for a way to do this without having them sign up for a monthly service such as Stamps. Endicia seems to be the best option, but I can't find anything that integrates it directly with OpenCart.
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