Prosellers Shell V2.0

Editing: IProduct.php

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<?php
/**
 * Universal interface for products that can be added to an Invoice
 * Standart products will have type == 'product'
 * Methods will be called once when added to the Invoice, no warranty
 * that it will be called agains
 * @package Am_Invoice
 */
interface IProduct
{
    const RECURRING_REBILLS = 99999;
    /** apply no tax to this product */
    const NO_TAX = 0;
    /* apply all enabled taxes */
    const ALL_TAX = -1;
    
    /**
     * Returned Id must be unique within a given Invoice for this Type of products
     */
    function getProductId();
    /**
     * Return short type of the item, ex. for Product returns "product"
     */
    function getType();
    function getTitle();
    function getDescription();
    function getFirstPrice();
    function getFirstPeriod();
    /**
     * Rebilling mode
     * @return int 0:"No Rebilling", 1:"Charge Second Price Once", a number:"Rebill x Times: ", RECURRING_REBILLS:"Unlimited Recurring Billing"
     */
    function getRebillTimes();
    function getSecondPrice();
    function getSecondPeriod();
    /** @return 3-letter ISO code, for example 'USD' */
    function getCurrencyCode();
    /** @return array|int - tax id#, (int)0 if no tax, (int)-1 if all enabled taxes are applicable (default) */
    function getTaxGroup();
    /**
     * Can the item be shipped? Should we calculate shipping
     * charges for it?
     */
    function getIsTangible();
    /**
     * Can qty of the item in the Invoice be not equal to 1?
     * For subscriptions this must be almost always "false"
     * For deliverable goods like cups this must be "true"
     */
    function getIsCountable();
    
    /** @return int default count if ids */
    function getQty();
    
    /** @return bool if product can have different qty than default */
    function getIsVariableQty();
    
    /** @return int */
    function getBillingPlanId();
    /** @return array */
    function getBillingPlanData();

/** @return array<mixed> */
    function getOptions();
    /** @param array<mixed> $options */
    function setOptions(array $options);
    
    /** @return string date Y-m-d start of subscription */
    function calculateStartDate($paymentDate, Invoice $invoice);
    
    
    /**
     * Must this product be added to one of existing items 
     * of the invoice, or this method may return NULL so item
     * will be added as new invoice line
     * @param array of InvoiceItem with same [item_type]
     * @return InvoiceItem|null 
     */
    function findItem(array $existingInvoiceItems);
    
    /**
     * Add quantity to invoice item - this method must return resulting value
     * @return int - resulting qty
     */
    function addQty($requestedQty, $itemQty);
}

Editing: IProduct.php

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