I want to charge the customer 1 euro whenever he wants to do the calculations offered in my system. Every time the customer wants to perform the calculations again, he will have to pay 1 euro again. Would a Laravel Cashier single charge be suitable for such a task or I should choose a simple Stripe SDK?
Yes, you can do this with the Cashier package.
First, the user should set up a payment method.
return view('update-payment-method', [
'intent' => $user->createSetupIntent()
]);
And then in your view:
<input id="card-holder-name" type="text">
<!-- Stripe Elements Placeholder -->
<div id="card-element"></div>
<button id="card-button" data-secret="{{ $intent->client_secret }}">
Update Payment Method
</button>
Then, you can charge the user every time you want to make a calculation.
// The amount is in cents. 100 = 1 euro
$stripeCharge = $user->charge(
100, $user->defaultPaymentMethod()
);