Validation rule

Rules\Redeemable validates a coupon-code form field and reports a precise, translatable message for the first failing reason — no need to catch six exceptions:

use RoundlyConsulting\Coupons\Rules\Redeemable;

$request->validate([
    'code' => ['required', 'string', new Redeemable(cartTotal: $cartTotal, redeemer: $request->user())],
]);

• Both arguments are optional: omit cartTotal to skip the currency and minimum-spend checks, omit redeemer to skip the per-redeemer cap.
• Empty, blank or non-string input and unknown codes fail with the not_found message. Codes match case-insensitively, so summer passes for SUMMER.
• The rule never mutates anything — usage is only incremented by a redemption.
• It asks Coupons::check() — the same checks, in the same order, as redemption and isRedeemableBy() — so they never disagree.

Messages

Messages live under the coupons::messages namespace; :code is replaced with the coupon code. The package ships English and Slovak with identical keys — the English defaults:

Translating

Slovak ships alongside English, so with the application locale set to sk every message and discount-type label is served in Slovak — no publishing needed. Publishing with the coupons-translations tag copies the Slovak file here:

// lang/vendor/coupons/sk/messages.php
return [
    'not_found' => 'Kupón „:code“ neexistuje.',
    'currency_mismatch' => 'Tento kupón nie je možné použiť vo vybranej mene.',
    'minimum_spend_not_met' => 'Vaša objednávka nedosahuje minimálnu hodnotu potrebnú pre tento kupón.',
    'expired' => 'Tento kupón už nie je k dispozícii.',
    'at_max_usage' => 'Tento kupón už dosiahol maximálny počet použití.',
    'already_redeemed' => 'Tento kupón ste už uplatnili.',

    'type' => [
        'fixed' => [
            'label' => 'Pevná suma',
            'description' => 'Odpočíta z ceny pevnú sumu.',
        ],
        'percentage' => [
            'label' => 'Percentuálna zľava',
            'description' => 'Odpočíta z ceny zadané percento.',
        ],
        'free_shipping' => [
            'label' => 'Doprava zadarmo',
            'description' => 'Označí objednávku na dopravu zadarmo.',
        ],
    ],
];

Edit the published files to reword the messages, or add another language under lang/vendor/coupons/<locale>/messages.php. The rule follows the application locale, so the same form shows the right message per locale.