PayPal is the faster, safer way to send money, make an online payment, receive money or set up a merchant account. It allows your customers to use a PayPal account balance or credit cards to make payments securely and safely. PayPal Standard is an offsite payment system, meaning payment is made on a PayPal secure page and not directly into your website.
You need Paypal Business or Premier accounts, if you have an existing Personal account -you can upgrade your account to a Premier or Business account.
Note: You do not need to enter username, password and signature. These are only necessary for recurring, adaptive payments and paypal pro.