100% discount on order not working

[kevinmeijer97]

Description

A client of ours wants to give out 100% free coupons for some products, this means that sometimes the total order value will be 0.
When you have a 0 euro order and use Mollie as your payment provider, the moment you press pay to redirect to mollie it gives out the following error:
Mollie\Api\Exceptions\ApiException [2023-02-17T13:36:32+0100] Error executing API call (422: Unprocessable Entity): The amount contains an invalid value. Field: amount.value. Documentation: https://docs.mollie.com/overview/handling-errors
Mollie can't handle 0 euro orders, which makes sense since theres nothing to pay.
What would make sense to me is to check for 0 value before redirecting to Mollie for payment.

Steps to reproduce

1. Setup basic checkout with Mollie as your payment provider
2. Create a 100% off coupon
3. Try and pay for the order

Environment

Environment
Application Name:
Laravel Version: 9.52.0
PHP Version: 8.1.11
Composer Version: 2.5.4
Environment: production
Debug Mode: OFF
URL: cityapptour.com
Maintenance Mode: OFF

Cache
Config: CACHED
Events: NOT CACHED
Routes: CACHED
Views: CACHED

Drivers
Broadcasting: log
Cache: redis
Database: mysql
Logs: daily
Mail: smtp
Queue: redis
Session: redis

Simple Commerce
Gateways: Dummy, Mollie
Repository: Customer: DoubleThreeDigital\SimpleCommerce\Customers\EloquentCustomerRepository
Repository: Order: DoubleThreeDigital\SimpleCommerce\Orders\EloquentOrderRepository
Repository: Product: DoubleThreeDigital\SimpleCommerce\Products\EntryProductRepository
Shipping Methods: Standard Post
Tax Engine: DoubleThreeDigital\SimpleCommerce\Tax\Standard\TaxEngine

Statamic
Addons: 10
Antlers: regex
Stache Watcher: Enabled
Static Caching: full
Version: 3.3.68 PRO

Statamic Addons
doublethreedigital/runway: 2.6.0
doublethreedigital/simple-commerce: 4.2.3
edalzell/blade-directives: 3.7
justbetter/sc-import-variant-data: dev-develop
justbetter/statamic-image-optimize: 1.1.4
mitydigital/iconamic: 1.1.2
simonridley/tracking-code-manager: dev-master
spatie/statamic-responsive-images: 2.15.2
webographen/statamic-dynamic-token: 1.0.0
withcandour/aardvark-seo: 2.0.30

[duncanmcclean]

Thanks for reporting this!

Instead of Simple Commerce trying to redirect the user to the off-site gateway for £0 orders, it'll now mark the order as paid and send them directly to the redirect URL you have set on the {{ sc:checkout:mollie }} tag.

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Released as part of v4.5.5.