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Good day @imvioleta,
Thank you for posting to the PayPal community.
Yes, 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.
You can get the PayPal transaction details by integration "Webhooks" event notifications service.
To add Shipping amount/fee use this parameter https://developer.paypal.com/docs/api/orders/v2/#orders_create!path=purchase_units/amount/breakdown/...
We recommend merchants to integrate our latest PayPal Checkout (Smart button) product.
Third party eCommerce Shopify develops their own plugins/modules.
I would suggest to please contact the support of the third party platform(eCommerce Shopify) who should be able to help regarding Shopify plugin/module setup and make sure to pass valid API requests to PayPal system.
Please follow the steps provided in the below detailed guide links :
https://developer.paypal.com/docs/checkout/
https://developer.paypal.com/demo/checkout/#/pattern/server
https://developer.paypal.com/integration-builder/
Please follow the below steps via your PayPal account.
Login PayPal.com >> Hover on your name at the top right corner >> 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 issue, 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
If this post or any other was helpful, please enrich the community by giving kudos or accepting it as a solution.

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Good day @imvioleta,
Thank you for posting to the PayPal community.
Yes, 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.
You can get the PayPal transaction details by integration "Webhooks" event notifications service.
To add Shipping amount/fee use this parameter https://developer.paypal.com/docs/api/orders/v2/#orders_create!path=purchase_units/amount/breakdown/...
We recommend merchants to integrate our latest PayPal Checkout (Smart button) product.
Third party eCommerce Shopify develops their own plugins/modules.
I would suggest to please contact the support of the third party platform(eCommerce Shopify) who should be able to help regarding Shopify plugin/module setup and make sure to pass valid API requests to PayPal system.
Please follow the steps provided in the below detailed guide links :
https://developer.paypal.com/docs/checkout/
https://developer.paypal.com/demo/checkout/#/pattern/server
https://developer.paypal.com/integration-builder/
Please follow the below steps via your PayPal account.
Login PayPal.com >> Hover on your name at the top right corner >> 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 issue, 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
If this post or any other was helpful, please enrich the community by giving kudos or accepting it as a solution.
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