Sum of purchase item amounts does not match total amount

Hi! We have had decimal quantities for ten years now and we have used Xocovis' Paytrail module where this has been handled also with the current Paytrail API.

Paytrail proposed this kind of approach:

The description field can be used to convey information about the contents of the order item. This could also include the quantity, for example: "1.5 meters" or "1.5 kg".

In this case:

The units field should always be set to 1, if the quantity is provided in the description field.

The unitPrice field should contain the total price of the sold product (not price per unit, but the full price for the quantity).

This way, the Paytrail interface would display both the sold quantity (e.g. 1.5 meters or 1.5 kg) via the description field and its price via the unitPrice field.

Could the module handle this in case of decimal quantities?

Thank you for very quick response and fix! A purchase with decimal quantities was successfully processed.

By the way, I am missing ApplePay which we have enabled if we use Paytrail's payment page. Is there some additional configuration to enable ApplePay (which I can see in test mode)?

ApplePay is enabled and domain listed in the merchand's panel because we have had it available in the Paytrail payment page, but I will ask help from Paytrail if they need to do something so that ApplePay becomes available with your module.

The issue does not seem to be fixed in the latest beta and dev releases:

Uncaught PHP Exception Paytrail\\SDK\\Exception\\ValidationException: "Amount doesnt match ItemsTotal" at vendor/paytrail/paytrail-php-sdk/src/PaytrailClient.php line 213

The error surfaced after upgrading Commerce Core to 3.1 and it is caused by order items with decimal quantities only.

4.0.0-beta2 because 3.1.2 requires Commerce ^2

I restored the site so that there was again Commerce 2.40 and Commerce Paytrail 3.1.2 and then I upgraded Commerce Paytrail to 4.0.0-beta2 and tested buying and after that I upgraded Commerce to 3.1 and tested buying again and now it seems to work. I honestly don't know anymore why I got the error message previously. Sorry!

I found out that with production credentials, Apple Pay is only visible when using Safari. Unfortunately, I don’t have a device with Apple Pay to verify this. It’s a bit confusing that Apple Pay is always visible when using test credentials.

God, now we got WSOD in production with two order items with quantities of 4 and 2 and neither of them have decimal quantities:

Paytrail\SDK\Exception\ValidationException: Amount doesnt match ItemsTotal funktiossa Paytrail\SDK\PaytrailClient->validateRequestItem() (line 213 vendor/paytrail/paytrail-php-sdk/src/PaytrailClient.php).

Commerce version was 3.1 and Paytrail 4.0@beta2. I had to downgrade them to 2.4 and 3.1.2.

The issue is related to free shipping for orders over 100 eur because the request has one item with value -590 which clearly affects Amount vs. ItemsTotal matching. If I decrease the units to 3 and total value is under 100 eur without shipping discount, I get no error.

{
    "stamp": "fb2279fe-1f11-4d33-b30a-cd01436240cd",
    "reference": "8723",
    "amount": 11600,
    "currency": "EUR",
    "language": "FI",
    "items": [
        {
            "unitPrice": 2900,
            "units": 4,
            "vatPercentage": 25.5,
            "productCode": "KUO-SL-01-WHI"
        },
        {
            "unitPrice": -590,
            "units": 1,
            "vatPercentage": 0,
            "productCode": "discount"
        },
        {
            "unitPrice": 0,
            "units": 1,
            "vatPercentage": 25.5,
            "productCode": "commerce_smartpost"
        }
    ],

But this error is introduced with 4.0@beta2 version (or Commerce 3.1).

Unfortunately I don't know how to install a merge request. We are using Composer for installing updates.

Payment is processed successfully now. Shipping unit price is now the same as the discount and the Amount matches.

When is the 4.x version scheduled for production?