How to get a customer ID

Sometimes, Amazon may ask for the customer ID (CID) for you or someone testing / using your skill, in order to perform debugging or whitelisting.

To get a CID:

1. If the customer in question = you, i.e. the Developer Console account, then you can follow instructions on How to get your vendor ID, which also gives your CID
2. Else, using a computer browser in incognito / private browsing mode, go to http://amazon.com and log in
3. In a new tab, go to http://amazon.com/profile
4. The end of the resulting URL in the address bar (prefixed with amzn1.account.*) is the CID. You can also just grab the full URL

Note that for customers of other regions such as UK or Germany, replace amazon.com with amazon.co.uk or amazon.de as needed. Other steps remain the same.