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 Business Account
To offer PayPal as a payment method in your store, you must have a PayPal business account and/or a PayPal Payflow account. The account requirements are specified in the description of each PayPal solution. Your PayPal merchant accountAn account with a bank or financial institution that makes it possible to accept credit card transactions. is also used to manage any fraud filters that are applied to purchases made from your store.
Customers who use PayPal Express Checkout or Express Checkout for Payflow Pro must have a PayPal buyer account. PayPal Payments Standard (which is some countries is called Website Payments Standard) can be used directly or through a buyer account, provided that the merchant enables PayPal Account Optional. By default, this parameter is enabled. Customers can choose to enter their credit card information, or create a buyer account with PayPal. When disabled, customers must first create a PayPal buyer account before making a purchase.
Website Payments Pro, Website Payments Pro Payflow Edition, Payflow Pro Gateway, and Payflow Link require customers to enter credit card information during checkout.