***THIS MUST BE DONE FROM A BUSINESS PAYPAL ACCOUNT***
Once you are logged into PayPal click on Pay and Get Paid
then under Accept Payments you want to go to PayPal Buttons
Next, proceed to Smart Buttons
Click Copy Code
Once you have to code head over to my account > update profile and scroll all the way to the bottom to Payment Options and paste the code in the box marked PayPal Script.
Don't forget to click save!