Since Paypal Payment Standard does not come with Opencart version 4.x. To Full fill this requirement. We come with
PayPal Payment Standard Gateway for 4.x Version Extension.
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The Paypal Payment Standard OpenCart extension is a powerful tool that integrates the PayPal payment gateway into your OpenCart-based online store. It provides a seamless and secure payment experience for your customers, allowing them to make purchases using various payment methods supported by PayPal.


Support will not be given in the Comments below and ANY support questions there will be ignored and deleted. Comments are for pre-sale questions and ratings only! Read the extension store policy Here(http://forum.opencart.com/viewtopic.php?t=91029)
For support please contact us at: ravikumar1986ravi@gmail.com

Demonstration