DHL PHP SDK is an unofficial resource that wraps some of the DHL SOAP API's functions, including shipment and label creation. Even though the SDK is unofficial, developers still need a DHL developer account (and possibly a DHL Intraship Account) to use the API.
It's not enough to print stamps off your printer any more. What shippers really want is what the SOAP-based Stamps.com API does: integrate that function of printing postage into your own web-based ecommerce or web hosted applications to speed up the shipment of orders out the door. With the API you can do much more than calculate postage and print stamps. You can clean addresses and track packages, among other tasks.
With the holiday season around the corner, ARTA, a logistics platform for shipping specialized items, is announcing the launch of the ARTA API, which will allow businesses to harness the power of ARTA's eCommerce tools that streamline complex logistics and bridge fragmented supply chains.