![]() Step 1: Create a New XML Writerįirst, you’ll need to create a new XML Writer. Here’s how you can format an AmazonEnvelope using C# XML Writer for the AU Scratchpad. Step-by-Step Guide to Formatting AmazonEnvelope with C# XML Writer This makes it an ideal choice when you need to create XML documents or fragments for use with Amazon MWS. Why Use C# XML Writer?Ĭ# XML Writer provides a fast, non-cached, forward-only way to generate streams or files containing XML data. It’s essentially the “envelope” that contains the “letters” (data) you’re sending to Amazon. The AmazonEnvelope is a structured XML message that Amazon MWS uses to exchange data between applications. In this post, we’ll show you how to format an AmazonEnvelope using the C# XML Writer. One common task many developers encounter when working with MWS is formatting the AmazonEnvelope to send data to Amazon. It provides a way to test MWS requests without writing any code. When working with Amazon’s Marketplace Web Service (MWS), the AU Scratchpad is a handy tool for developers. ![]() I can't stress enough how important it is to use the scratchpad.| Miscellaneous How to Format AmazonEnvelope using C# XML Writer for AU Scratchpad Be sure to use a timestamp as indicated - I had to write something to create a 20-char representation of the current zulu time by calling CEEUTC and CEEDATM (there is an example on this forum somewhere) Convert your string-to-sign to ASCII before calculating the MD5 - again, the scratchpad will show you thisģ. Build your parameter strings (keywords & variables) in ascending order (numbers, upper, then lower) - it all has to be in the same order as you see in the scratchpad - even the line feedsĢ. When posting XML data stored in a streamfile (inventory levels), you have to also calculate the MD5 for the XML content.ġ. I also used Qc3CalculateHash (IBM API) for the "Content MD5 Value" used in the SubmitFeed operation. I used Qc3CalculateHMAC (IBM API) as Ted indicated above. I used Scott's HTTPAPI, BASE64, and WEBFORMS to build my strings and do the conversion to ASCII I only implemented the Feeds API (SubmitFeed operation) and Orders API (ListOrders, ListOrderItems, and each of those. The key to all of them is calculating the MD5 Hash correctly and using the Amazon Scratchpad to test/verify. There are so many different APIs, but they all work basically the same. Yes, I did get this working for our purposes (APIs for Getting orders, updating inventory levels, updating orders as shipped). ![]() Jay - Sorry, I was on vacation last week. The documentation for MWS is very detailed, but contains some discrepancies. I added the MD5 to the end of the query string in the &Signature variable. Rc = http_url_post(.I did NOT have to add the Content-MD5 header. Consult the service documentation for details."Ĭode: String = 'POST' + LF + '' + LF +/Orders/'. Check your AWS Secret Access Key and signing method. When I post (without the Content-MD5 in the header), I receive: "The request signature we calculated does not match the signature you provided. But I'm not sure how to calcuate the value for "Content-MD5" in the header. I believe the latter is the Signature value from my original post. Troubleshooting Amazon MWS Product Feed submission issues can be complex but is crucial for maintaining accurate product listings. You can submit your feed and see real-time results, including errors. It also provides the "Post Data" along with two other values: "SHA 256 HMAC" and "Base64 HMAC". Amazon MWS Scratchpad is a valuable tool for troubleshooting. The MWS scratchpad gives me a "string to sign" which I can match. In looking at http_debug.txt, i can see that I do not have "Content-MD5" and "Content-type" are not present. ![]() My problem is understanding the "Signature" and the "Content-MD5" header. Scott - you showed me before how to add headers using HTTPAPI - so I think I can do that. Did you add code for that, Ted? Or did Amazon accept the request without it?I'm still struggling to understand these web services, the MD5 hash etc. HTTPAPI does not automatically set the content-md5 header. ![]()
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