First you need to open discord.com/app
in your browser. This guide and the following screenshots are from Chrome so Firefox or another browser may differ but it is relatively the same. Once you are there, click on the three dots in the top right hand corner of the browser, then go to more tools
and then developer tools
.
Next thing is to go to the network tab. This may be hidden in the dropdown, if so click on the chevrons and chose network
from the options.
Third you now need to search for me
and give the page a refresh. This searches for the subscriptions endpoint in Discord's API which is authorised by your token.