Init repo

Helper/Data.php

+<?php
+
+namespace Meetanshi\Paymulti\Helper;
+
+use Magento\Framework\App\Helper\AbstractHelper;
+use Magento\Framework\App\Helper\Context;
+use Magento\Sales\Api\Data\OrderInterface;
+use Magento\Store\Model\ScopeInterface;
+use Magento\Store\Model\StoreManagerInterface;
+
+/**
+ * Class Data
+ * @package Meetanshi\Paymulti\Helper
+ */
+class Data extends AbstractHelper
+{
+    /**
+     *
+     */
+    const MEETANSHI_MODULE_ENABLE = 'paymulti/general/active';
+
+    /**
+     * @var StoreManagerInterface
+     */
+    protected $storeManager;
+
+    /**
+     * @var OrderInterface
+     */
+    protected $order;
+
+    /**
+     * @var
+     */
+    protected $extraPrice;
+
+    /**
+     * @var
+     */
+    protected $itemPrice;
+
+    /**
+     * Data constructor.
+     * @param Context $context
+     * @param StoreManagerInterface $storeManager
+     * @param OrderInterface $order
+     */
+    public function __construct(
+        Context $context,
+        StoreManagerInterface $storeManager,
+        OrderInterface $order
+    ) {
+        $this->storeManager = $storeManager;
+        $this->order = $order;
+        parent::__construct($context);
+    }
+
+    /**
+     * @return array
+     */
+    public static function getSupportedCurrency()
+    {
+        return ['AUD', 'CAD', 'CZK', 'DKK', 'EUR', 'HKD', 'HUF', 'ILS', 'JPY', 'MXN',
+            'NOK', 'NZD', 'PLN', 'GBP', 'SGD', 'SEK', 'CHF', 'USD', 'TWD', 'THB', 'INR'];
+    }
+
+    /**
+     * @return bool
+     */
+    public static function shouldConvert()
+    {
+        return !self::isActive();
+    }
+
+    /**
+     * @return mixed
+     */
+    public function isActive()
+    {
+        return $this->scopeConfig->getValue(self::MEETANSHI_MODULE_ENABLE, ScopeInterface::SCOPE_STORE);
+    }
+
+    /**
+     * @param $quote
+     * @return mixed
+     * @throws \Magento\Framework\Exception\NoSuchEntityException
+     */
+    public function getConvertedGrandTotal($quote)
+    {
+        $toCurrency = $this->getCurrentCurrency();
+        $currentCurrency = $this->storeManager->getStore()->getCurrentCurrencyCode();
+        if ($toCurrency == $currentCurrency) {
+            return $quote->getGrandTotal();
+        } else {
+            return $this->getConvertedBaseAmount($quote->getBaseGrandTotal());
+        }
+    }
+
+    /**
+     * @return mixed
+     * @throws \Magento\Framework\Exception\NoSuchEntityException
+     */
+    public function getCurrentCurrency()
+    {
+        return $this->storeManager->getStore()->getCurrentCurrency()->getCode();
+    }
+
+    /**
+     * @param $value
+     * @return mixed
+     * @throws \Magento\Framework\Exception\NoSuchEntityException
+     */
+    public function getConvertedBaseAmount($value)
+    {
+        $baseCurrency = $this->storeManager->getStore()->getBaseCurrencyCode();
+        $currentCurrency = $this->getCurrentCurrency();
+        $amount = $this->convertCurrency($value, $baseCurrency, $currentCurrency);
+        return $amount;
+    }
+
+    /**
+     * @param $amountValue
+     * @param null $currencyCodeFrom
+     * @param null $currencyCodeTo
+     * @return mixed
+     * @throws \Magento\Framework\Exception\NoSuchEntityException
+     */
+    public function convertCurrency($amountValue, $currencyCodeFrom = null, $currencyCodeTo = null)
+    {
+        return $this->storeManager->getStore()->getBaseCurrency()->convert($amountValue, $currencyCodeTo);
+    }
+
+    /**
+     * @return array
+     * @throws \Magento\Framework\Exception\NoSuchEntityException
+     */
+    public function getCurrencyArray()
+    {
+        return [$this->storeManager->getStore()->getBaseCurrencyCode()];
+    }
+
+    /**
+     * @param $orderID
+     * @return mixed
+     * @throws \Magento\Framework\Exception\NoSuchEntityException
+     */
+    public function getPaymentOrderCurrency($orderID)
+    {
+        $order = $this->order->load($orderID);
+        if ($order) {
+            $payment = $order->getPayment();
+            return $payment->getAdditionalInformation('payment_currency');
+        }
+        return $this->getCurrentCurrency();
+    }
+
+    /**
+     * @param $identifier
+     * @return mixed
+     */
+    public function getConfig($identifier)
+    {
+        return $this->scopeConfig->getValue(
+            $identifier,
+            ScopeInterface::SCOPE_STORE
+        );
+    }
+
+    /**
+     * @param $key
+     * @param $value
+     */
+    public function addExtraPrice($key, $value)
+    {
+        $this->extraPrice[$key] = $value;
+    }
+
+    /**
+     * @param $i
+     * @param $key
+     * @param $value
+     */
+    public function addItemPrice($i, $key, $value)
+    {
+        $this->itemPrice[$i][$key] = $value;
+    }
+
+    /**
+     * @param array $request
+     * @return array
+     */
+    public function convertRequest(array &$request)
+    {
+        $itemAmount = 0;
+        $extraprice = 0;
+        foreach ($this->itemPrice as $item) {
+            $itemAmount = $itemAmount + ((int)$item['qty'] * (float)$item['amount']);
+        }
+        foreach ($this->extraPrice as $key => $value) {
+            $extraprice = (float)$extraprice + (float)$value;
+        }
+        $baseprice = $extraprice + $itemAmount;
+
+        $request['AMT'] = number_format($baseprice,2);
+
+        $request['ITEMAMT'] = $itemAmount;
+        return $request;
+    }
+}

Model/Express.php

+<?php
+
+namespace Meetanshi\Paymulti\Model;
+
+use Magento\Paypal\Model\Express\Checkout as ExpressCheckout;
+use Meetanshi\Paymulti\Helper\Data;
+use Magento\Paypal\Model\Express as PaypalExpress;
+
+/**
+ * Class Express
+ * @package Meetanshi\Paymulti\Model
+ */
+class Express extends PaypalExpress
+{
+    /**
+     * @var Data
+     */
+    protected $helper;
+
+    /**
+     * Express constructor.
+     * @param \Magento\Framework\Model\Context $context
+     * @param \Magento\Framework\Registry $registry
+     * @param \Magento\Framework\Api\ExtensionAttributesFactory $extensionFactory
+     * @param \Magento\Framework\Api\AttributeValueFactory $customAttributeFactory
+     * @param \Magento\Payment\Helper\Data $paymentData
+     * @param \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig
+     * @param \Magento\Payment\Model\Method\Logger $logger
+     * @param \Magento\Paypal\Model\ProFactory $proFactory
+     * @param \Magento\Store\Model\StoreManagerInterface $storeManager
+     * @param \Magento\Framework\UrlInterface $urlBuilder
+     * @param \Magento\Paypal\Model\CartFactory $cartFactory
+     * @param \Magento\Checkout\Model\Session $checkoutSession
+     * @param \Magento\Framework\Exception\LocalizedExceptionFactory $exception
+     * @param \Magento\Sales\Api\TransactionRepositoryInterface $transactionRepository
+     * @param \Magento\Sales\Model\Order\Payment\Transaction\BuilderInterface $transactionBuilder
+     * @param Data $helper
+     * @param array $data
+     */
+    public function __construct(
+        \Magento\Framework\Model\Context $context,
+        \Magento\Framework\Registry $registry,
+        \Magento\Framework\Api\ExtensionAttributesFactory $extensionFactory,
+        \Magento\Framework\Api\AttributeValueFactory $customAttributeFactory,
+        \Magento\Payment\Helper\Data $paymentData,
+        \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
+        \Magento\Payment\Model\Method\Logger $logger,
+        \Magento\Paypal\Model\ProFactory $proFactory,
+        \Magento\Store\Model\StoreManagerInterface $storeManager,
+        \Magento\Framework\UrlInterface $urlBuilder,
+        \Magento\Paypal\Model\CartFactory $cartFactory,
+        \Magento\Checkout\Model\Session $checkoutSession,
+        \Magento\Framework\Exception\LocalizedExceptionFactory $exception,
+        \Magento\Sales\Api\TransactionRepositoryInterface $transactionRepository,
+        \Magento\Sales\Model\Order\Payment\Transaction\BuilderInterface $transactionBuilder,
+        Data $helper,
+        array $data = []
+    )
+    {
+        $this->helper = $helper;
+        parent::__construct($context, $registry, $extensionFactory, $customAttributeFactory, $paymentData, $scopeConfig, $logger, $proFactory, $storeManager, $urlBuilder, $cartFactory, $checkoutSession, $exception, $transactionRepository, $transactionBuilder, null, null, $data);
+    }
+
+    /**
+     * @param \Magento\Sales\Model\Order\Payment $payment
+     * @param float $amount
+     * @return $this|PaypalExpress
+     * @throws \Magento\Framework\Exception\LocalizedException
+     * @throws \Magento\Framework\Exception\NoSuchEntityException
+     */
+    protected function _placeOrder(\Magento\Sales\Model\Order\Payment $payment, $amount)
+    {
+        $order = $payment->getOrder();
+
+        // prepare api call
+        $token = $payment->getAdditionalInformation(ExpressCheckout::PAYMENT_INFO_TRANSPORT_TOKEN);
+
+        $cart = $this->_cartFactory->create(['salesModel' => $order]);
+
+        if ($this->helper->isActive()) {
+            $amount = number_format($this->helper->getConvertedGrandTotal($order), 2);
+            $currencyCode = $this->helper->getCurrentCurrency();
+        } else {
+            $amount = $amount;
+            $currencyCode = $order->getBaseCurrencyCode();
+        }
+
+        $payment->setAdditionalInformation('payment_currency', $currencyCode);
+        $api = $this->getApi()->setToken(
+            $token
+        )->setPayerId(
+            $payment->getAdditionalInformation(ExpressCheckout::PAYMENT_INFO_TRANSPORT_PAYER_ID)
+        )->setAmount(
+            $amount
+        )->setPaymentAction(
+            $this->_pro->getConfig()->getValue('paymentAction')
+        )->setNotifyUrl(
+            $this->_urlBuilder->getUrl('paypal/ipn/')
+        )->setInvNum(
+            $order->getIncrementId()
+        )->setCurrencyCode(
+            $currencyCode
+        )->setPaypalCart(
+            $cart
+        )->setIsLineItemsEnabled(
+            $this->_pro->getConfig()->getValue('lineItemsEnabled')
+        );
+        if ($order->getIsVirtual()) {
+            $api->setAddress($order->getBillingAddress())->setSuppressShipping(true);
+        } else {
+            $api->setAddress($order->getShippingAddress());
+            $api->setBillingAddress($order->getBillingAddress());
+        }
+
+        // call api and get details from it
+        $api->callDoExpressCheckoutPayment();
+
+        $this->_importToPayment($api, $payment);
+        return $this;
+    }
+}

Model/Paypal/Config.php

+<?php
+
+namespace Meetanshi\Paymulti\Model\Paypal;
+
+use Magento\Paypal\Model\Config as PayPalConfig;
+
+/**
+ * Class Config
+ * @package Meetanshi\Paymulti\Model\Paypal
+ */
+class Config extends PayPalConfig
+{
+    /**
+     * @var \Meetanshi\Paymulti\Helper\Data
+     */
+    protected $helper;
+    /**
+     * @var array
+     */
+    protected $_supportedCurrencyCodes = [
+        'AUD',
+        'CAD',
+        'CZK',
+        'DKK',
+        'EUR',
+        'HKD',
+        'HUF',
+        'ILS',
+        'JPY',
+        'MXN',
+        'NOK',
+        'NZD',
+        'PLN',
+        'GBP',
+        'RUB',
+        'SGD',
+        'SEK',
+        'CHF',
+        'TWD',
+        'THB',
+        'USD',
+        'INR',
+    ];
+
+    /**
+     * Config constructor.
+     * @param \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig
+     * @param \Magento\Directory\Helper\Data $directoryHelper
+     * @param \Magento\Store\Model\StoreManagerInterface $storeManager
+     * @param \Magento\Payment\Model\Source\CctypeFactory $cctypeFactory
+     * @param \Magento\Paypal\Model\CertFactory $certFactory
+     * @param \Meetanshi\Paymulti\Helper\Data $helper
+     * @param array $params
+     */
+    public function __construct(
+        \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
+        \Magento\Directory\Helper\Data $directoryHelper,
+        \Magento\Store\Model\StoreManagerInterface $storeManager,
+        \Magento\Payment\Model\Source\CctypeFactory $cctypeFactory,
+        \Magento\Paypal\Model\CertFactory $certFactory,
+        \Meetanshi\Paymulti\Helper\Data $helper,
+        $params = []
+    ) {
+        parent::__construct($scopeConfig, $directoryHelper, $storeManager, $cctypeFactory, $certFactory, $params);
+        $this->helper = $helper;
+    }
+
+    /**
+     * @param string $code
+     * @return bool
+     * @throws \Magento\Framework\Exception\NoSuchEntityException
+     */
+    public function isCurrencyCodeSupported($code)
+    {
+        if ($this->helper->isActive()) {
+            $this->_supportedCurrencyCodes =
+                array_merge($this->_supportedCurrencyCodes, $this->helper->getCurrencyArray());
+        }
+
+        if (in_array($code, $this->_supportedCurrencyCodes)) {
+            return true;
+        }
+        if ($this->getMerchantCountry() == 'BR' && $code == 'BRL') {
+            return true;
+        }
+        if ($this->getMerchantCountry() == 'MY' && $code == 'MYR') {
+            return true;
+        }
+        if ($this->getMerchantCountry() == 'TR' && $code == 'TRY') {
+            return true;
+        }
+        return false;
+    }
+}

Model/Source/Currency.php

+<?php
+
+namespace Meetanshi\Paymulti\Model\Source;
+
+/**
+ * Class Currency
+ * @package Meetanshi\Paymulti\Model\Source
+ */
+class Currency extends \Magento\Config\Model\Config\Source\Locale\Currency
+{
+    /**
+     * @var \Magento\Framework\Locale\ListsInterface
+     */
+    protected $_localeLists;
+    /**
+     * @var \Magento\Store\Model\StoreManagerInterface
+     */
+    protected $_currencySymbol;
+    /**
+     * @var \Meetanshi\Paymulti\Helper\Data
+     */
+    protected $_helper;
+
+    /**
+     * Currency constructor.
+     * @param \Magento\Framework\Locale\ListsInterface $localeLists
+     * @param \Magento\Store\Model\StoreManagerInterface $currencySymbol
+     * @param \Meetanshi\Paymulti\Helper\Data $helper
+     */
+    public function __construct(
+        \Magento\Framework\Locale\ListsInterface $localeLists,
+        \Magento\Store\Model\StoreManagerInterface $currencySymbol,
+        \Meetanshi\Paymulti\Helper\Data $helper
+    ) {
+        $this->_localeLists = $localeLists;
+        $this->_currencySymbol = $currencySymbol;
+        $this->_helper = $helper;
+        parent::__construct($localeLists);
+    }
+
+    /**
+     * @return array
+     * @throws \Magento\Framework\Exception\NoSuchEntityException
+     */
+    public function toOptionArray()
+    {
+        $_supportedCurrencyCodes = $this->_helper->getSupportedCurrency();
+        $_availableCurrencyCodes = $this->_currencySymbol->getStore()->getAvailableCurrencyCodes(true);
+        ;
+        if (!$this->_options) {
+            $this->_options = $this->_localeLists->getOptionCurrencies();
+        }
+        $options = [];
+        foreach ($this->_options as $option) {
+            if (in_array($option['value'], $_supportedCurrencyCodes) && in_array($option['value'], $_availableCurrencyCodes)) {
+                $options[] = $option;
+            }
+        }
+        return $options;
+    }
+}

composer.json

+{
+  "name": "meetanshi/magento2-paypal-multi-currency",
+  "description": "Magento 2 paypal multi currency",
+  "require": {
+    "php": "~5.5.0|~5.6.0|~7.0.0|7.0.2|7.0.4|~7.0.6|~7.1.0|~7.2.0|~7.3.0"
+  },
+  "type": "magento2-module",
+  "version": "1.0.4",
+  "license": [
+    "OSL-3.0"
+  ],
+  "autoload": {
+    "files": [
+      "registration.php"
+    ],
+    "psr-4": {
+      "Meetanshi\\Paymulti\\": ""
+    }
+  },
+  "support": {
+    "email": "support@meetanshi.com"
+  },
+  "authors": [
+    {
+      "name": "Jignesh Parmar",
+      "email": "support@meetanshi.com",
+      "homepage": "https://meetanshi.com"
+    }
+  ]
+}

etc/acl.xml

+<?xml version="1.0"?>
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Acl/etc/acl.xsd">
+    <acl>
+        <resources>
+            <resource id="Magento_Backend::admin">
+                <resource id="Magento_Backend::stores">
+                    <resource id="Magento_Backend::stores_settings">
+                        <resource id="Magento_Config::config">
+                            <resource id="Meetanshi_Paymulti::config_paymulti" title="Paypal Multi Currency" />
+                        </resource>
+                    </resource>
+                </resource>
+            </resource>
+        </resources>
+    </acl>
+</config>

etc/adminhtml/routes.xml

+<?xml version="1.0"?>
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:App/etc/routes.xsd">
+    <router id="admin">
+        <route id="paymulti" frontName="paymulti">
+            <module name="Meetanshi_Paymulti" />
+        </route>
+    </router>
+</config>

etc/adminhtml/system.xml

+<?xml version="1.0"?>
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Config:etc/system_file.xsd">
+    <system>
+        <tab id="meetanshi" translate="label" class="meetanshi" sortOrder="99998">
+            <label></label>
+        </tab>
+        <section id="paymulti" translate="label" type="text" sortOrder="20" showInDefault="1" showInWebsite="1" showInStore="1">
+            <label>PayPal Multi Currency</label>
+            <tab>meetanshi</tab>
+            <resource>Meetanshi_Paymulti::config_paymulti</resource>
+            <group id="general" translate="label" type="text" sortOrder="100" showInDefault="1" showInWebsite="1" showInStore="1">
+                <label>Configuration</label>
+                <field id="active" translate="label" type="select" sortOrder="1" showInDefault="1" showInWebsite="1" showInStore="1">
+                    <label>PayPal Multi Currency</label>
+                    <source_model>Magento\Config\Model\Config\Source\Enabledisable</source_model>
+                </field>
+            </group>
+        </section>
+    </system>
+</config>

etc/config.xml

+<?xml version="1.0"?>
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Store:etc/config.xsd">
+ <default>
+  	<paymulti>
+   		<general>
+ 			<active>1</active>
+ 		</general>
+  	</paymulti>
+   </default>
+</config>

etc/di.xml

+<?xml version="1.0"?>
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../../lib/internal/Magento/Framework/ObjectManager/etc/config.xsd">
+	<preference for="Magento\Paypal\Model\Express\Checkout" type="Meetanshi\Paymulti\Model\Express\Checkout"/>
+	<preference for="Magento\Paypal\Model\Api\Nvp" type="Meetanshi\Paymulti\Model\Api\Nvp"/>
+	<preference for="Magento\Paypal\Model\Express" type="Meetanshi\Paymulti\Model\Express"/>
+	<preference for="Magento\Paypal\Model\Config" type="Meetanshi\Paymulti\Model\Paypal\Config" />
+</config>

etc/module.xml

+<?xml version="1.0"?>
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
+    <module name="Meetanshi_Paymulti" setup_version="1.0.4" schema_version="1.0.4">
+    </module>
+</config>

registration.php

+<?php
+\Magento\Framework\Component\ComponentRegistrar::register(
+    \Magento\Framework\Component\ComponentRegistrar::MODULE,
+    'Meetanshi_Paymulti',
+    __DIR__
+);

view/adminhtml/layout/adminhtml_system_config_edit.xml

+<?xml version="1.0"?>
+<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
+    <head>
+        <css src="Meetanshi_Paymulti::css/meetanshi.css"/>
+    </head>
+</page>

view/adminhtml/web/css/meetanshi.css

+.meetanshi .title:before {
+    background-image: url(https://meetanshi.com/media/logo.png);
+    background-size: 150px 19px;
+    display: inline-block;
+    width: 150px;
+    height: 19px;
+    content: "";
+    background-repeat: no-repeat;
+}