Paypal funding

I ve got a problem with pay pal when trying to fund project

After selecting reward and put name and email, when I click on “commit to funding”, I ve got the message “Please wait while we process your transaction..” but nothing else….

last year We ‘ve been working with an other plugin in this same web (ignition deck) and all working well but now we decide to change and work with your theme and plugin.

In the settings I put the same credentials for paypal that we have with the other plugin ( user ID, App ID etc…), so we are sure that they are correct and the app is approved.

Any issue?

Thks