integrate into my project Paypal and 2checkout

- i want to help me to integrate paying with "paypal, visa, mastercard and 2checkout" . - i want to you to illustrate how to implement that at any new project . - just build simple app: edittext to enter amount of money and buttons to pay . - please give me the sourcecode and simple tutorial from you to how to do that by myself. notice: - i don't need to get the client token from server just create the token of whole application. - in payment with paypal, visa and mastercard using braintree: [login to view URL]