Retrieves a list of countries, optionally filtered by CountryID or DialCode.
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The unique identifier of the country to filter the results.
The dialing code of the country to filter the results.
A list of countries matching the specified criteria.
The unique identifier of the country.
The ISO 3166-1 alpha-2 code of the country (e.g., "US" for the United States).
The full name of the country.
The international dialing code for the country (e.g., 1 for the United States).
An internal reference number associated with the country.
The ISO 3166-1 numeric code of the country (e.g., 840 for the United States).