PayPal is used to securely send payments over the internet. The service is incredibly safe and committed to protecting the privacy of its users.
All you need is to link your credit, debit, or bank account details to a PayPal account which can be created here.
When checking out you will be asked to login to your PayPal account and your financial information will be protected. navabi offers an alternate check-out using PayPal Guest, allowing you to still protect your information without having a registered PayPal account.
The PayPal website provides a very comprehensive list of FAQs at: https://www.paypal.com/de/smarthelp/contact-us
Click here for PayPal's user agreement.