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,

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