PayPal is an international digital wallet based payment processor that allows payments and money transfers to be made through the Internet. PayPal operates in 203 countries, over 152 million active, registered accounts and allows customers to send, receive, and hold funds in 26 currencies worldwide. Some unique features offered by PayPal are PayPal Here (mobile payments app), standalone Payflow Payment Gateway, virtual terminal, online invoicing, BillMeLater with no-interest financing and pay-as-you-go for selling digital goods. It also provides customer support options such as Answers, community forum, Knowledgebase, Phone/Email and social media supports on Facebook and Twitter.
Yes, the PayPals Rest API can be used by Merchant in 202 countries. It covers most of the countries and to be sure you may look up for your country here: https://www.paypal.com/us/webapps/mpp/country-worldwidePayment Gateways (US) PayPal