Hello, I have downloaded a sample script to get familiarized with the Amazon SDK. [LoginandPaywithAmazonSDK-php-1.0.8_US.zip] I'm trying to set up a test sandbox login but it's giving me error that . [b]client_id is invalid[/b]. Here's the content of my config file. My clientId is blank because I don't know where to get it. Can someone tell me where to get it? I already set up my AWS account and sandbox account. I also attached the screenshot of the error message. Thank you in advance for your help.