Problem: Error code at Checkout with Paypal Payments Pro when trying to order item using Express Checkout on Storefront
Example:
Solution: This may happen due to invalid PayPal API credentials. You should update those in SureDone and see if it resolves the issue OR may have to contact PayPal to correct this issue.
You may have to delete and add back in your credentials on SureDone, that can be done by going to Settings > Storefront > Payments>PayPal