We are using the Pro version of the site, but for specific reasons, we're using the Buttons right now. We have 2 buttons in this page. PayPal is in Sandbox mode.
The first one is a one-time payment button. This works perfectly fine.
The 2nd one is a renewable package where the user will be charged an amount after 2 weeks for each 2 weeks.
When I follow the 2nd link, I get this error: https://i.imgur.com/PraQuOm.png
The link you have used to enter the PayPal system is invalid. Please review the link and try again.
Any idea why this is happening?