Good day @Anonymous_User,
Thank you for posting to the PayPal community.
Third party platforms eCommerce develops their own plugins/modules.
I suggest to please contact the support of your third party platform(eCommerce) who can able to help you regarding plugins/modules setup.
PayPal system is a payment gateway, which will receive the payment request payload (i.e Payment and Item details, Shipping details, Invoice number, Amount details etc.) from merchant websites(built via third party platforms eCommerce Shopify) and process the payments accordingly.
Merchants should handle their internal website code and pass the appropriate payment API calls to PayPal system.
Important : We recommend merchants to integrate our latest PayPal Checkout (Smart button) product soon.
Guide link : https://developer.paypal.com/docs/checkout/standard/
Please follow the below steps via your PayPal account.
Login PayPal.com >> click on "settings icon" >> go to "Account settings" >> Website payments >> PayPal buttons >> select "Smart Buttons" button type >> fill all the required details.
(Or)
Login PayPal.com >> go to direct link "https://www.paypal.com/buttons/" >> follow the above steps
If your still facing any issues, please create a MTS ticket via - https://www.paypal-support.com/s/?language=en_US with the detail information and error details.
Sincerely,
Chiranjeevi
PayPal/Braintree MTS
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