Ads.txt stands for Authorized Digital Sellers and is a simple, flexible and secure method that publishers and distributors can use to publicly declare the companies they authorize to sell their digital inventory.
nginx [engine x] is a HTTP server and mail proxy server written by Igor Sysoev.
PayPal is a American international e-commerce service that enables companies and individuals to send money and to accept payments without revealing any financial details.
Websites that accepts payments with American Express.
websites using the $ symbol on their website - meaning it may accept payment in this currency used in Israel.
The http-equiv attribute provides an HTTP header for the information/value of the content attribute. The http-equiv attribute can be used to simulate an HTTP response header.