To process payments for the goods or services you provide with your site, or to raise funds, use the PayPal integrated payment button.
To do this:
Create a PayPal account, if you do not have one already.
Select the Apps tab at the top of the builder screen and click the PayPal widget.
Select the type of button from the menu on the left.
Enter details in the text boxes on the right.
Click Add and your payment button will be created.
Note: Select Embed from the Elements tab to add standalone payment buttons from other payment gateways.
You can list your products with an image, title, description, and price:
Click the Commerce tab at the top of the builder screen.
Click the New Product widget.
Enter your PayPal Email ID.
Select the payment denomination. Click OK.
Click on this widget after it's added to your page to customize it.