Changes to List countries

the response's body type changed from no type to object for status 200

removed CountryListResponse subschema #2 from the response body allOf list for the response status 200

added the non-success response with the status 401

added the required property countries to the response with the 200 status

the endpoint scheme security bearerAuth was added to the API

api operation id Getalistofcountries removed and replaced with buy_countries_list

added CountryListResponse to the response body allOf list for the response status 200

removed BuyCountriesResponse from the response body allOf list for the response status 200

endpoint added