CouponRepositoryInterface.php

<?php

//...

interface CouponRepositoryInterface
{
    /**
     * Get all coupons.
     *
     * @param null $filterableKeyword
     * @param array $orders
     * @return LengthAwarePaginator
     */
    public function getAllCoupons(
        $filterableKeyword = null,
        array $orders = [
            [
                'column' => 'name',
                'direction' => 'asc'
            ]
        ]
    );
}