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Added PayPal
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.
Content Security Policy is best used as defense-in-depth, to reduce the harm caused by content injection attacks.
When running in a browser on a mobile phone, "format-detection" meta tag determines whether or not telephone numbers in the HTML content will appear as hypertext links. The user can click a link with a telephone number to initiate a phone call to that phone number.