Amazon orders without billing address
Amazon orders don't always have a billing address as Amazon keep this secret for their customer's security.
When these orders are sent to our Magento store they include the shipping address but not the billing address. Click and Drop does not pull orders from Magento without a valid billing address, so these orders are not pulled into Click and Drop.
Since click and Drop is for creating postage labels, why would there be any need to include a billing address, let alone validate it or reject orders that don't have it?
Perhaps you could remove the need for billing address validation form connected marketplaces, otherwise Click and Drop simply doesn't work as it is supposed to.