OAuth 2.0 Web login

Hi Support, 

We need to support oculus login on our website, this account linking is the only doc I found that can be used for web login, but this flow doesn't support param state, we can not pass state to oculus and oculus can not pass back state to us, therefore we can not find the original request from the user, so my question:

1. Is the account linking flow correct for web login? If no, is there any other doc about login with oculus?

2. Does the account linking flow support state param? Or any other params that can be used to receive from us and give back fto us?

Thanks