Hi @maigret
The PayPal documentation you referenced does not apply to PayPal Payments, as it pertains only to Payflow, a legacy PayPal product.
PayPal Payments incorporates Advanced Card Processing for card transactions, the direct successor to Payflow. For Vaulting with Advanced Card Processing, Reference Transactions are not necessary. However, you must be enabled for Advanced Credit and Debit Card payments.
For Vaulting with PayPal accounts, your PayPal business account must be approved for Reference Transactions.
The plugin documentation is always up-to-date in this regard. You can learn more about the Vaulting feature and how to sign up here: https://woocommerce.com/document/woocommerce-paypal-payments/#vaulting-saving-a-payment-method
Additionally, detailed information on how PayPal Payments works with subscriptions can be found here: https://woocommerce.com/document/woocommerce-paypal-payments/#subscriptions-faq
Watch for the next plugin update if your PayPal business account is not enabled for Reference Transactions, but you want to sell subscriptions. It will introduce functionality allowing you to process PayPal subscriptions without Reference Transactions. We can share more about it in the coming weeks.
I hope this helps!
Kind regards,
Niklas