Aaron D. Campbell

This plugins gives you a great framework to use for integrating with PayPal. 
It stores both live and sandbox API credentials and allows you to switch back 
and forth easily. All NVP API calls are passed through the framework and 
default values such as API version, API credentials, and even currency code are 
added to the request based on settings from the admin panel.
It also has a built in IPN listener that validates messages as coming from 
PayPal then throws WordPress actions based on messages received. For example it 
throws “paypal-recurring_payment_profile_cancel” when someone cancels a 
recurring payment that they had set up with you. It passes along all the info 
that PayPal sent to the action, so it’s simple to create other plugins that use 
this one.
Requires PHP5.
You may also be interested in WordPress tips and tricks at <a href="http://wpinformer.com" rel="nofollow ugc">WordPress Informer</a> or gerneral <a href="http://webdevnews.net" rel="nofollow ugc">Web Developer News</a>

PayPal Framework

PayPal integration framework and admin interface as well as IPN listener.

WebToffee

ThemeHigh

Integrate PayPal payments easily in WooCommerce stores with Express & Smart Checkout, credit/debit cards, Pay Later, and local payment options.
<h3>Introduction</h3>
Integrate PayPal with WooCommerce to accept payments through the secure PayPal payment gateway. You can add PayPal Express Checkout or PayPal Smart Checkout payment gateway to your WooCommerce store with the ThemeHigh WooCommerce PayPal payment gateway plugin.
With this WooCommerce PayPal plugin, your customers can use their credit cards, debit cards, PayPal Credit, Pay Later offers (Pay in 4), or PayPal money to make an order from the cart page itself. With the WooCommerce PayPal smart button, you can also allow your customers to make payments using the preferred payment methods in their country/region auto-detected by PayPal.
With PayPal Express Checkout or PayPal Smart Checkout enabled you can ensure a smoother experience for your users as they never have to leave your website for making payments. PayPal for WooCommerce makes the payment process quick, easy, and convenient.
<h3>Major Features of the PayPal Express Checkout Payment Gateway Plugin for WooCommerce</h3>
🔸 Reduce clicks by enabling WooCommerce PayPal Express Checkout in your store 
🔸 Enable PayPal Smart Checkout – The payment plugin auto-detects the customer’s country/device and shows available payment methods (including local payment methods) at checkout [New] 
🔸 Supports <a href="https://developer.paypal.com/docs/checkout/apm/" rel="nofollow ugc">PayPal’s Alternative Payment Method</a> that helps customers to pay with their bank accounts, wallets, and other local payment methods such as:
<ul>
<li>Bancontact</li>
<li>BLIK</li>
<li>eps</li>
<li>iDEAL</li>
<li>MyBank</li>
<li>Pay upon Invoice</li>
<li>Przelewy24</li>
</ul>
🔸 Smart checkout button customization – customize label, color, shape, layout, size, etc. [New] 
🔸 Option to enable PayPal Standard payment gateway 
🔸 Accept PayPal Money 
🔸 Accept PayPal Credit (buy now and pay later) 
🔸 Accept credit cards and debit cards through PayPal 
🔸 Completes orders from cart and checkout page. The premium version supports making PayPal payments from the product page and mini-cart! 
🔸 Customize the PayPal payment options visible to customers with various settings and configurations. 
🔸 Add invoice prefix to identify store order 
🔸 Faster checkout by skipping the order review page 
🔸 Tested OK with WooCommerce 10.0.2
<h3>Importance of PayPal Checkout for your WooCommerce Store</h3>
<a href="https://www.paypal.com/us/webapps/mpp/home" rel="nofollow ugc">PayPal</a> is one of the faster and more secure options for online payments. It has millions of active users globally making it one of the leading payment platforms. By integrating the PayPal payment gateway with your WooCommerce store (using the PayPal checkout plugin), you will be able to increase conversions and reduce cart abandonment at a drastic rate.
Payment Gateway of PayPal for WooCommerce is one of the best WooCommerce PayPal plugins that facilitates integration with PayPal. The WooCommerce payment plugin is an easy-to-use tool that offers everything from faster checkout to recurring payment support (available in premium).
To learn about the installation and setup of this free WooCommerce PayPal plugin, visit the <a href="https://www.themehigh.com/docs/payment-gateway-plugin-for-paypal-woocommerce-free-setup-guide/" rel="nofollow ugc">plugin documentation</a> page.
To set up PayPal Smart Button, refer to this set-up video <iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/zKRREFIYmFA?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>
<h3>Pro version</h3>
<h3>WooCommerce PayPal Plugin Premium Version Features</h3>
✅ Add PayPal Express checkout option on the product page 
 ✅ Add PayPal Smart checkout option on individual product page [New] 
 ✅ Accepts payment using multiple Alternative Payment Methods (APM) based on country or device [New] 
 ✅ Set up mini-cart for faster checkout 
 ✅ Capture authorized payment later with PayPal 
 ✅ Enable partial and full refunds of the order amount directly from the order admin page 
 ✅ PayPal WooCommerce customization options like button style, position, etc. 
 ✅ Option to enable In-Context checkout, keep customers inside your store during checkout 
 ✅ Supports <a href="https://woocommerce.com/products/woocommerce-subscriptions/" rel="nofollow ugc">WooCommerce Subscriptions</a> and <a href="https://www.themehigh.com/product/subscriptions-for-woocommerce/" rel="nofollow ugc">Subscriptions for WooCommerce by ThemeHigh</a> 
 ✅ Shortcode support for the Paypal Express button 
 ✅ PayPal checkout payment gateway allows users to pay with their credit card without leaving the site (Guest checkout) 
 ✅ Option to set up a specific PayPal locale 
 ✅ Option to set up express checkout cancel page URL 
 ✅ Timely compatibility updates and bug fixes 
 ✅ Premium support!
For the complete list of features and details regarding WooCommerce PayPal, please visit <a href="https://www.themehigh.com/product/paypal-express-checkout-gateway-for-woocommerce/" rel="nofollow ugc">ThemeHigh PayPal Express Checkout Payment Gateway for WooCommerce</a>
<h4>Related Plugins from ThemeHigh</h4>
<a href="https://wordpress.org/plugins/payment-gateway-stripe-and-woocommerce-integration/" rel="ugc">Stripe Payment Plugin for WooCommerce</a> – Accept payments via Stripe in your WooCommerce store. Enable Apple Pay, Google Pay, Alipay, or Stripe Checkout.

Payment Gateway of PayPal for WooCommerce

Enable faster checkout with PayPal for WooCommerce. Add PayPal Express/PayPal Standard gateways that accept PayPal, Pay Later, debit & credit cards.

PayPal Framework vs Payment Gateway of PayPal for WooCommerce