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If you have registered your own discount types in the core, you will likely want to provide an interface so authenticated staff members can add the data required.
You need to make sure you have registered your discount with the Lunar core beforehand.
use Lunar\Hub\Facades\DiscountTypes;
use App\Http\Livewire\Components\CustomDiscountComponent;
use App\DiscountTypes\MyCustomDiscountType;

DiscountTypes::register(MyCustomDiscountType::class, CustomDiscountComponent::class);
The component UI should then appear when the user has chosen the custom discount type. Create a Livewire component to handle your custom discount type. 
<?php

namespace App\Http\Livewire\Components;

use Lunar\Facades\DB;
use Lunar\Models\Discount;
use Lunar\Hub\Http\Livewire\Components\Discounts\Types\AbstractDiscountType;

class CustomDiscountComponent extends AbstractDiscountType
{
    /**
     * The instance of the discount.
     *
     * @var Discount
     */
    public Discount $discount;

    /**
     * {@ineheritDoc}.
     */
    public function rules()
    {
        return [
            'discount.data' => 'array',
        ];
    }

    /**
     * {@inheritDoc}
     */
    public function mount()
    {
        parent::mount();
    }

    public function getValidationMessages()
    {
        return [];
    }

    /**
     * Handle when the discount data is updated.
     *
     * @return void
     */
    public function updatedDiscountData()
    {
        $this->emitUp('discountData.updated', $this->discount->data);
    }

    /**
     * Save the product discount.
     *
     * @return void
     */
    public function save($discountId)
    {
        $this->discount = Discount::find($discountId);

        DB::transaction(function () {
            // ...
        });
    }

    /**
     * Render the livewire component.
     *
     * @return \Illuminate\View\View
     */
    public function render()
    {
        return view('my-custom-discount-ui')
            ->layout('adminhub::layouts.base');
    }
}