Calculate upcoming charge when coupons are used

[salmanhijazi]

Hello,

From my understanding so far, the discount of a coupon gets applied at the time the order is being processed. I want to show users the amount they will be charged in the next cycle when they have a coupon redeemed. Here's how I'm planning to get this done:

1. Get the scheduled order item from the subscription
2. Get the redeemed coupon details for the subscription and check if the redeemed coupon times_left > 0
3. Get the discount amount/percentage from the coupon and calculate the final invoice amount
4. Display it to the user

Is there a better way to do this? Doing it this way will require me to code the same logic as that in a coupon preprocessor. Maybe use some internal functions to execute preprocessors and calculate the amount but not create order items until they're needed?

Thanks!

[salmanhijazi]

Anything?

[sandervanhooft]

Notice that multiple order items can be scheduled for a billable model, not all are necessarily tied to a subscription.

[salmanhijazi]

In my use case so far, we only have one active subscription per user. There would be features with one-time fees coming up, but I don't think that would interfere with the scheduled items. Again, are there no internal functions that I can use to calculate these values? I tried looking through the source but didn't find anything outside of those that are executed at the time of processing.

Cheers

[sandervanhooft]

I agree a simpler method is desirable, I've struggled with the same in Spark. Feel free to suggest an approach for this and/or submit a PR.

We're planning to (alpha) launch v2 in a month or so, this feature would be good for v3.

[salmanhijazi]

I managed to get it done by using almost only package functions. Here's how I got around to it in my controller.

$scheduledOrderItems = $subscription->scheduledOrderItem->toCollection();
$redeemedCoupons = $subscription->redeemedCoupons()->active()->get();

$redeemedCoupons->each(function($redeemedCoupon) use (&$scheduledOrderItems) {
        $scheduledOrderItems->push( $redeemedCoupon->handler()->getDiscountOrderItems($scheduledOrderItems)->first() );
});

$upcomingPayment['total_payable'] = money(0, $scheduledOrderItems->first()->getCurrency());

scheduledOrderItems->each(function ($item) use (&$upcomingPayment) {
        $upcomingPayment['total_payable'] = $upcomingPayment['total_payable']->add($item->getTotal());
        $upcomingPayment['payables'][] = array(
                'description' => $item->description,
                'price' => $this->formatAmount($item->getTotal())
        );
});

$upcomingPayment['total_payable'] = $this->formatAmount($upcomingPayment['total_payable']);

Not the cleanest, but gets the job done for now. If you find any optimizations, please do suggest!

Looking forward to v2.
Thank you!