Adding the Express Checkout Button
You must show a Clearpay checkout button on your cart and/or product pages to enable Express Checkout. When clicked, the Clearpay checkout button will start the checkout process in a popup flow (the redirect flow can optionally be used with Deferred Shipping).
Shopify Limitations on Checkout Pages: How to Overcome Them for Better Conversion Rate
Handle Paypal Express Checkout PHP
Managing additional checkout buttons on the cart page – Pixel Union
Event Tracking For Paypal Express Checkout Buttons on Tag Manager - Tag Manager Community
Adding the Express Checkout Button
How to Set Up WooCommerce Express Checkout with PeachPay - YayCommerce
Creating a Shareable Payment Link (Text Link or URL) - WP Express Checkout
Express Checkout (FunnelKit Cart)
Adding PayPal Payment Buttons to Your WordPress Sidebar Easily - Tips and Tricks HQ
How to Add Express Checkout Buttons in WooCommerce