osb/app/Interfaces/ProductSupplier.php

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<?php
namespace App\Interfaces;
use Illuminate\Support\Collection;
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interface ProductSupplier
{
/**
* Return the traffic inclusion with the service
*
* @return mixed
*/
public function allowance(): Collection;
/**
* Render the traffic inclusion as a string
*
* @return mixed
*/
public function allowance_string(): string;
/**
* Return the product cost
*
* @return float
*/
public function getCostAttribute(): float;
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/**
* Return the supplier class
* If there is a model relationship return:
* return $this->getRelationValue('supplier');
* otherwise return a stdClass with name
*
* @return mixed
*/
public function getSupplierAttribute();
}