How to set up subscription and users relationship

Hello, on the app i'm building Users will have the option to subscribe. I'm a bit confused if I should have a 'subscription_id' field on 'create_users_table' or if it should be the other way, having a 'user_id' on the 'create_subscription_table'. I'm also a bit confused on the model relationship at the moment I have them like this.

'create_users_table'

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

return new class extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('users', function (Blueprint $table) {
            $table->id();
            $table->string('username');
            $table->string('name');
            $table->text('avatar')->nullable();
            $table->string('email')->unique();
            $table->integer('phone')->unique();
            $table->string('address');
            $table->string('country');
            $table->string('province');
            $table->string('city');
            $table->timestamp('email_verified_at')->nullable();
            $table->string('password'); // hashed in setPasswordAttribute function on user model
            $table->foreignId('role_id')->constrained()->cascadeOnDelete();
            $table->rememberToken();
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('users');
    }
};

'create_subscription_table'

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

return new class extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('subscriptions', function (Blueprint $table) {
            $table->id();
            $table->foreignId('user_id')->constrained('users','id')->cascadeOnDelete();
            $table->dateTime('start_date');
            $table->dateTime('next_billing_date');
            $table->boolean('subscribed');
            $table->float('price');
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('subscriptions');
    }
};

User model relationship

public function subscription() {
        return $this->belongsTo(Subscription::class, 'subscription_id');
    }

Subscription model relationship

public function subscribers()
    {
        return $this->hasMany(User::class);
    }

I'm a bit confused and I'm not sure on how should I structure this or what should be the best way.