Address Validation Test - This included example plugin serves not only as a guide for registering a custom address validation plugin, but also as a mock validation endpoint for building custom address validation user interfaces.
addressValidation - The purpose of this methods is only to create a
AddressValidationResults and not doing any actual address validation.
Using the provided
address.postal code we return several different types of validation results
address.postal codes beginning with "9" will always return as valid.