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Unlocking with one-time purchases

For more complex membership setups involving recurring subscriptions, my other plugin, Kirby Klub, may be a better option. However, you can still use the Kirby Kart plugin to unlock content or services based on customers purchasing single products with one-time payments.

<?php

$product = page('products/vip-access');

if ($product->ownedByUser(kirby()->user())) {

}

// alternative
if (kirby()->user()?->hasPurchased($product)) {

}

You could use this approach to forward specific flags to the provider's checkout callback as well.

<?php

return [
    'bnomei.kart.provider.stripe.checkout_options' => function (\Bnomei\Kart\Kart $kart) {
        // https://docs.stripe.com/api/checkout/sessions/create
        return [
            'discounts' => array_filter([
                'coupon' => page('products/vip-access')->ownedByUser() ? 'VIP_ACCESS' : null,
            ]),
        ];
    },
    // other options
];

Creating Subscriptions

Since you have full control over the checkout_options, as shown in the example for Stripe above, you could transform a checkout session from the payment mode to the subscription mode and create subscriptions. If you need something like that consider using the Klub plugin, booking a call or hiring me.