More Product Model optimisation

app/Interfaces/ProductItem.php

@@ -20,30 +20,6 @@ interface ProductItem
 	 */
 	public function allowance_string(): string;
 
-	/**
-	 * Return the contract term for this product when sold as a service
-	 *
-	 * @return int Months
-	 */
-	public function getContractTermAttribute(): int;
-
-	/**
-	 * Return the product cost
-	 *
-	 * @return float
-	 */
-	public function getCostAttribute(): float;
-
-	/**
-	 * 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();
-
 	/**
 	 * Does this offering capture usage information
 	 *