PaymentMethodTokenRecipientKem.ephemeralPublicKey, using ECDH.GooglePaymentsPublicKeysManager.GooglePaymentsPublicKeysManager.GooglePaymentsPublicKeysManager.KEYS_URL_PRODUCTION).GooglePaymentsPublicKeysManager.KEYS_URL_TEST).PaymentMethodTokenRecipient.PaymentMethodTokenSender.SenderIntermediateCertFactory.sealedMessage by performing the necessary signature verification and
decryption (if required) steps based on the protocolVersion.