Hi,
I have already contacted the PayPal Plus Plugin (for WooCommerce) developer and he said it is a problem of the theme and I should contact you.
The mistake is in german language.
“Entschuldigen Sie, es gab einen Validierungsfehler bei der Sendung von Daten an PayPal. Bitte überprüfen Sie Ihre Informationen.”
It means that there is a validation error.
Would appreciate your help.
Thank you
Kind regards,
Victoria