oauth 2.0 Authentication

[ottz0]

I'm using vue.js with Statamic Pro and I need authentication to connect to a third party "Form Assembly" API so I can use get requests to pull in forms into my Statamic website.

However, I need to authenticate firstly with their API using oauth 2.0 and i'm not sure which way to go about it.
Once Authenticated I need to just pick up the token and add it to my requests.

Should I use the statamic oauth service, laravel passport or use vue.js for the login and token requests?

All of which should just be able to store the token for me in order to just pick it up and send it once authenticated. Have'nt done much auth before so i'm not sure which way to go.

If I use Statamic how can I get to the token? Is it stored in localStorage?