Issuu, how to write issuu.documents.list request correctly?

I want to use issuu.documents.list to list my document from issuu, It work fine. But when I add two more parameters startIndex and pageSize, it doesn't work. Here is my signing request:

[apiSecret]accessprivateactionissuu.documents.listapiKey[apiKey]startIndex0pageSize20formatxmlresponseParamstitle,documentId

and My request url:

http://api.issuu.com/1_0?action=issuu.documents.list&apiKey=[apiKey]&access=private开发者_StackOverflow&startIndex=0&pageSize=20&format=xml&responseParams=title%2CdocumentId&signature=[signature]

So, may you show me what's wrong in my syntax with startIndex and pageSize parameters? Many thanks,

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All requests to the issuu api have to be signed (as you know). Before creating an md5 hash of your signature, you must first order all the keys alphabetically.

WRONG

[apiSecret]accessprivateactionissuu.documents.listapiKey[apiKey]startIndex0pageSize20formatxmlresponseParamstitle,documentId

CORRECT

[apiSecret]accessprivateactionissuu.documents.listapiKey[apiKey]pageSize20formatxmlresponseParamstitle,documentIdstartIndex0

So in your example, you have startIndex positioned before responseParams when it really should go after it.

Alphabetically ordering the keys in your signature is a requirement of Issuu's API as documented here. http://issuu.com/services/api/signingrequests.html