I need to determine the device_id using cookies, but there are two types available. Could you please advise on which value to use?
- amp_xxxxx : lowercase ‘amp’ with 6 digits of project API
- AMP_xxxxxxxxxx : uppercase ‘AMP’ with 10 digits of project API
I have read the material from the link, and it states that option 2 is correct, but the screenshot example shows option 1, which is confusing. Additionally, most users who visit our service have cookie option 2, but there are still some who do not. Therefore, I am unsure if using option 2 is the correct choice. Could you please explain the difference between the two cookie options and advise which one would be more appropriate to use?