PayPal is an online payment system that makes paying for things online and sending and receiving money safe and secure. When you link your bank account, credit card, or debit card to your PayPal account, you can use PayPal to make purchases online with participating stores. 

Short Direction: {Amazcart> Dashboard> Payment Gateways> Paypal> Sandbox/Live> Paypal Client ID> Paypal Client Secret Key> Gateway Logo> Update.}

PayPal is free for online and in-store consumer transactions without currency conversion. The PayPal sandbox is a self-contained, virtual testing environment that simulates the live PayPal production environment. If you fill in all the empty boxes, click on the Update button.

1- Paypal

2- Sandbox/Live

3- Paypal Client ID

4- Paypal Client Secret Key

5- Gateway Logo

6- Update it.