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In TMF 670 API v4 version , for the TokenizedCard PaymentMethod type ,  as per the yaml specification there are 2 attributes mentioned as 'required' where as per the  Conformance documentation 4 attributes are mandatory. ( cardNumber, brand, lastFourDigits,expirationDate) . Can this discrepancy be fixed in the yaml file ? Thank you. 

"TokenizedCard": {
            "description": "A Tokenized Card method of payment.",
            "type": "object",
            "required": [
                "lastFourDigits",
                "expirationDate"
            ]

I have logged an issue to correct this in yaml spec https://github.com/tmforum-apis/TMF670_PaymentMethods/issues/3