Get Laravel Sanctum Personal Access Token Plain Text, Generated previously

Hi everyone!

I have a login API, Whenever someone logs in, the API will generate a token and return to the user. The problem is, if the user sends the request again and again even after receiving the token at the first. The API will generate another token everytime. So, I have found these solutions:

1. Delete old token whenever user logs in.
2. Check if a token already exists for the requested user login, then return the old token.

Problem in solution 1: When user sends the login request he won't send the bearer token (obviously). So, how would I delete the old token of that user?

Problem in solution 2:

$user = User::findUserByEmail($request->input('email'));
$user->tokens()->where('name', 'auth_token')->first();

In above code I get the row of the personal access token table but I don't get the plainText token to return to the user.

If someone provides me solution for both problems, it will be very appreciated!

Thanks in advance!