Hank here from Shopify.
Thank you for providing the error message, that really helps both myself and the community in providing feedback and solutions.
With your error, 'You do not have a verified ACH', I took a look for you and can see that this is specifically a PayPal error, but I have found more information about this on their website. I have the specific error message for you below.
For further information relating to this, I would advise reaching out to PayPal directly as they would have the best advice if there are any other issues associated with your PayPal account.
If you have any other questions, let me know!