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POAmazon MWS - request signature calculated does not match the signature provided
primarykey
Id
2777078
data
AcceptedAnswerId
8002444
AnswerCount
22
ClosedDate
CommentCount
1
CommunityOwnedDate
CreationDate
2010-05-05T21:55:56.440
FavoriteCount
3
LastActivityDate
2018-05-23T17:16:50.347
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6158
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PostTypeId
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Score
59
ViewCount
78923
LastEditorDisplayName
text
Body
<p>Getting the following error message from <a href="https://mws.amazonservices.com/" rel="noreferrer">https://mws.amazonservices.com/</a>:</p> <pre><code><Type>Sender</Type> <Code>SignatureDoesNotMatch</Code> − <Message> The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details. </Message> </code></pre> <p>Here is the VB.net code I am using to calculate the request. I have removed the SecretKey and AWSAccessKeyId for security reasons.</p> <pre><code>Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load Dim sURL As String = "https://mws.amazonservices.com/" Dim sRequest As String = "" sRequest &= "Acknowledged=" & Server.UrlEncode("false") sRequest &= "&Action=" & Server.UrlEncode("GetReportList") sRequest &= "&AWSAccessKeyId=" & Server.UrlEncode("REMOVED-FOR-SECURITY") sRequest &= "&Marketplace=" & Server.UrlEncode("REMOVED-FOR-SECURITY") sRequest &= "&Merchant=" & Server.UrlEncode("REMOVED-FOR-SECURITY") sRequest &= "&SignatureMethod=" & Server.UrlEncode("HmacSHA256") sRequest &= "&SignatureVersion=" & Server.UrlEncode("2") sRequest &= "&Timestamp=" & Server.UrlEncode(DateTime.Now.ToString("yyyy-MM-ddTHH:mm:ssCST")) sRequest &= "&Version=" & Server.UrlEncode("2009-01-01") Dim StringToSign As String = "GET\n" & "mws.amazonservices.com\n" & "/\n" & sRequest sRequest &= "&Signature=" & Server.UrlEncode(HashString(StringToSign)) Response.Write("<a href=""" & sURL & "?" & sRequest & """>Click here</a>") End Sub Public Shared Function HashString(ByVal StringToHash As String) As String Dim myEncoder As New System.Text.UTF8Encoding Dim Key() As Byte = myEncoder.GetBytes("REMOVED-FOR-SECURITY") Dim XML() As Byte = myEncoder.GetBytes(StringToHash) Dim myHMACSHA256 As New System.Security.Cryptography.HMACSHA256(Key) Dim HashCode As Byte() = myHMACSHA256.ComputeHash(XML) Return Convert.ToBase64String(HashCode) End Function </code></pre>
Tags
<asp.net><amazon-web-services>
Title
Amazon MWS - request signature calculated does not match the signature provided
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1. USKyle Ballard
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1. COits Amazon AWS or MWS?
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  USRam

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