PayEscrow is a secure online payment processing service that comes with PHP Laravel.
Demo: https://codecanyon.net/item/payescrow-online-payment-processing-service/32719701
This payment gateway for WooCommerce allows your customers to enter their credit card information on your site and let you process the data manually (offline) using your payment terminal.
Demo: https://www.wplab.com/plugins/offline-credit-card-processing-woocommerce/
Leve is a Retina ready responsive HTML template for online banking and payment processing startups. Has 3+ beautiful demos with internal pages.
Demo: https://themeforest.net/item/leve-banking-payment-processing-html-template/28881346