Good day @Ahmeds38,
Thank you for posting to the PayPal community.
Please cross check your LIVE PayPal Business account and make sure it is verified and confirmed without any account limitations.
I would suggest to please contact the support of third party eCommerce support, who should be able to help you regarding the plugins/modules setup and make sure your website system is passing valid API requests to PayPal system.
https://developer.paypal.com/docs/api/orders/v2/
https://developer.paypal.com/api/rest/reference/orders/v2/errors/#create-order
Third party platforms eCommerce develops their own plugins/modules.
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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