How to use CodingKeys for enums conforming to Codable Protocol?

Question

I have an EmailVerificationStatus enum with an associated type of String that conforms to the Codable protocol:

enum EmailVerificationStatus: String, Codable {
    case unverified
    case verified
}

The webservice I am working with sends those cases in uppercase (UNVERIFIED / VERIFIED). How can I use the CodingKeys enumeration to map that difference? Something like the following does not work:

enum CodingKeys: String, CodingKey {
    case unverified = "UNVERIFIED"
    case verified = "VERIFIED"
}

Answer 1

Ok. That was simple. No CodingKeys needed:

enum EmailVerificationStatus: String, Codable {
    case verified = "VERIFIED"
    case unverified = "UNVERIFIED"
}

Answer 2

This is how I usually do it:

struct EmailVerificationStatus: String, Codable {
    var unverified: String
    var verified: String

    enum CodingKeys: String, CodingKey {
        case unverified = "UNVERIFIED"
        case verified = "VERIFIED"
    }
}