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How to Convert PPT/PPTX to PDF with Aspose.Slides Cloud Rest API

I am new in aspose. I don’t know how to use REST Api in that so,I used this link which was mentioned in live example which converts ppt to pdf. I put my appSID in that and put appKey in signature but it is not working. What I have to put in signature?.Kindly help me with this.
I am using following link

I am getting following error

Authentication failed!


Thank you for contacting Aspose Support.

In order to use Aspose Cloud API you have to first sign up at and create and obtain a APPS ID and API Key. Once you have these, you then need to sign your URL. I have attached a sample Java application that demonstrates how you can sign your application URL with your APPS ID and API (1.4 KB)

You can also view Resource URLs for all of our API Operations here.

Let me know if you need any more help.

Kind Regards,
Mateen Sajjad