When you enable Paypal payment method in your Magento store for the first time it might not work as expected. Pressing Place Order button redirects you to Paypal, but instead of login form you get error “Unable to process payment. Please contact the merchant as the shipping address provided by the merchant is invalid, and the merchant has requested that your order must be shipped to that address.”. Below you can find solution to your problem. Continue reading “Magento. Fix Paypal “Unable to process payment””