Magento 2.0.18 is the final 2.0.x release. After March 2018, Magento 2.0.x will no longer receive security patches, quality fixes, or documentation updates. To maintain your site's performance, security, and PCIPayment Card Industry: Refers to debit and credit cards and their associated businesses. compliance, upgrade to the latest version of Magento.
PayPal Payment Gateways
PayPal offers a choice of two payment gatewayA service that charges your customers’ credit cards and sends the funds to your merchant account, for deposit into your business bank account. solutions for your business. You can have PayPal host your checkout on its secure payment site, or you can take control of the entire payment experience with a completely customizable solution.