IDFA/GAID letter case

Question

Is there a standard/convention regarding the letter case of IDFA (Identifier for Advertising) and GAID (Google Advertising ID)?

I couldn't find anything conclusive about this. Links to relevant documents will be appreciated.

Answer 1

It seems from the examples in Advertising ID Documentation that GAID is stored lowercase, the last example also shows a wrapper class which might mean you don't have to worry about this.

With regards to the Apple version I could not see any examples in their own documentation, but the example shown on Possible Mobile's article on Unique Identifiers shows it in Uppercase. I don't know the site to say whether thats actually a reliable source. Like Android, Apple has some wrapper classes which seem to provide the ID to you so you again might not need to worry about formatting.