PTA Encryption using DES3 encryption algorithm

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Hi Folks,

 

I hope some of you have come across this; I am implementing a PTA using des3 algorithm; below are further details:

1. PTA using Triple DES Encryption: I am able to build PTA URL and encrypt using DES3 algorithm; but I get a decryption failed error(error code 9); which means PTA String when decrypted cannot restore original PTA String. Am I implementing this algorithm right? or What is happening at back end?
2. Little more background on PTA Add-in - When the add-in loads, logged in agents session ID is retrieved and passed as a URL parameter to Custom script(pta_helper.php). In that; I am fetching Standard Config setting like PTA_SECRET_KEY and assumption here is that every Staff account has a Contact Record present. Fetching account details like email_ID(which is same as login ID of Contact for PTA p_userid), first-name, last-name and returns a PTA String to add-in.