API reference has links to request & response codes but that info is incomplete. For example VMORC uses a country key for the redemption_country, the request &response codes only has a small list of country keys and there's no indication where to get the complete list. And in the case of language parameter there´s no link to any list so it's not possible to know what values are to be used. Documentation should have complete references and a correct link to the info.
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