Any Laravel Cashier users here?

I haven't run into the exact situation you mention, but I was planning to use Cashier as well for a project awhile ago and noticed that it didn't fit my situation either. I'm sure its nice in certain instances, but its basically just a wrapper on top of the Stripe PHP class. You can always just use the Stripe API directly to match your situation.

Here's some demo code, not sure if its helpful to get you started:

//Use the config for the stripe secret key
\Stripe\Stripe::setApiKey(env('STRIPE_SECRET'));

// Create the customer on Stripe's servers
try {
    $customer = \Stripe\Customer::create([
        "description" => $request->organization,
        "name" => $request->name,
        "email" => $request->email,
        "source" => $request->token // obtained with Stripe.js
    ]);
} catch(\Stripe\CardError $e) {
    $e_json = $e->getJsonBody();
    $error = $e_json['error'];
    // The card has been declined
    // redirect back to checkout page
    return back()->with('stripe_errors',$error['message']);
}

// Create the charge on Stripe's servers - this will charge the user's card
try {
    $subscription = \Stripe\Subscription::create([
        'customer' => $customer->id,
        'items' => [['plan' => $plan_id]],
    ]);
} catch(\Stripe\CardError $e) {
    $e_json = $e->getJsonBody();
    $error = $e_json['error'];
    // The card has been declined
    // redirect back to checkout page
    return back()->with('stripe_errors',$error['message']);
}