In order to start accepting PayPal payment for your products, you need to configure the list of payment systems - https://smartpayment.pro/app/profile/edit

Mark "Enable payment in PayPal":

Next you need to register "Name of API user", "API Password," Sign":

In order to get an API Username, API Password, Sign, go to your Paypal account - https://www.paypal.com/myaccount/home.
Go to the settings tab and select “Request API Credentials”. Select the option to “Request API Signature”.

Copy your PayPal API Username, API Password, and API Signature into the corresponding fields inside of Smart Payment:

Further select "In what currency to transfer the amount for payment" and "Language of PayPal pages at the time of order payment" and click "Save":

After that, when you order, you will receive a payment method "PayPal":

In order to check whether you have set everything up correctly, click on the "Pay" button and you should be redirected to the PayPal payment page:
Now you can accept payment via PayPal!
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If you have any questions, please contact support.
Sincerely, Smart Payment Team!