Paypal Buttons Greyed Out
Why do Paypal buttons grey out?
The only reasons PayPal buttons will stay grey is due to a required field not being entered into the checkout or your PayPal integration API Keys are wrong.
You can check the PayPal keys within Marketing > Integrations and click the "test" buttons.
To check the required fields edit your checkout page and ensure there are no fields which have been hidden, but are required. You are then ready to load your checkout page, ensuring that all form fields are filled out.