computer and icons online shopping payments financial transactions

ecommerce online payments digital wallet credit card debit ssl security secure checkout payment gateway transaction history order confirmation shopping cart mobile contactless paypal cryptocurrency blockchain buyer protection refund policy user authentication processing merchant account phishing experience banking fraud detection api integration process invoices validation subscription services loyalty programs sales tax shipping options product return receipt abandonment customer support financial regulations data encryption twofactor microtransactions peertopeer code fee affiliate marketing computer concepts icons transactions transactions