You need to ensure that the value in a custom field "Source Country" is validated against the standard list of ISO countries that are valid for the particular type of order, when the order is saved.
What is the best way to achieve this requirement?

What type of data cannot be imported using the import wizard?

Universal Containers has limited in-house development resources, but would like to support online payment processing for its products.
What is the recommended solution to meet this requirement?

What are the standard Lightning components?

What language is used to query Salesforce for specific information?