Good day @huho
Thank you for posting to the PayPal community.
I believe you are referring to PayPal Website Payments Standard (WPS) is a legacy integration.
I would like to suggest that you try again by clearing browser's cache and cookies.
Important : Yes, we recommend merchants to integrate our latest PayPal Checkout (Smart button) product.
To ensure a seamless transition, I suggest using the following URL: https://developer.paypal.com/integration-builder/ to generate the button code required for your website. This will help you take advantage of the advanced features and improved functionality offered by PayPal Checkout (Smart button).
Additionally, before you begin coding, it is essential to familiarize yourself with some key points. To gain a better understanding of these points, I urge you to refer to the following link:
https://developer.paypal.com/docs/checkout/standard/integrate/#link-knowbeforeyoucode.
For additional information, please visit the following links.
https://developer.paypal.com/docs/checkout/
https://developer.paypal.com/demo/checkout/#/pattern/server
If you are still experiencing issues, please create an MTS ticket via the following URL - https://www.paypal-support.com/s/?language=en_US .Please ensure that you provide detailed information and error details when submitting the ticket.
Sincerely,
Kavya
PayPal 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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