Good day @jackiecycle,
Thank you for posting to the PayPal community.
Please cross check your PayPal Business account and make sure it is verified and confirmed without any account limitations.
Also, process a test payment via card which is not linked to your PayPal account, since merchants can't perform self payments.
This should be an issue with your internal website(built via third party platform(eCommerce)) which is passing invalid payment requests to PayPal system.
Sample HTML button code : View sample HTML code that shows various payment features and options for each PayPal payment button.
https://developer.paypal.com/api/nvp-soap/paypal-payments-standard/integration-guide/Appx-websitesta...
https://developer.paypal.com/api/nvp-soap/paypal-payments-standard/integration-guide/sample-code-lan...
Important : PayPal Website Payments Standard (WPS) is a legacy integration.
We recommend merchants to integrate our latest PayPal Checkout (Smart button) product.
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 >> 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 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
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