Laravel 8 API guard multi provider

Question

I'm trying to make an API using Laravel 8. I have two user tables, third_party_users and customer_users

domain.tld/api/v1 --> for open API (third-party)
domain.tld/api/frontend --> for frontend app (customer)

but in config/auth.php

'guards' => [
    'web' => [
        'driver' => 'session',
        'provider' => 'customers',
    ],

    'api' => [
        'driver' => 'passport',
        'provider' => ??????????, // what I must to do?
    ],
],

'providers' => [
    'customers' => [
        'driver' => 'eloquent',
        'model' => App\Models\Customer::class,
    ],
    'thirdparty' => [
        'driver' => 'eloquent',
        'model' => App\Models\ThirdParty::class,
    ],
],

and in app/Providers/RouteServiceProvider.php

Route::middleware('api')
    ->namespace($this->namespace)
    ->group(base_path('routes/api.php'));

what I must write parameter provider in api guard on config/auth.php? and how to make sure when request to api/v1 using thirdparty provider and api/frontend using customer provider?

please help me. thanks before.