}
service RFKPOS {
    rpc CommitTransaction(CommitTransactionRequest) returns (CommitTransactionResponse);
}
enum Currency {
    EUR = 0;
    USD = 1;
    NOK = 2;
    BTC = 3;
    LTN = 4;
    ETH = 5;
    DOT = 6;
}
message Money {
    int64 value = 0;
    uint64 dec = 1;
    Currency cur = 2;
}
message Timestamp {
    uint32 year = 1;
    uint32 month = 2;
    uint32 day = 3;
    uint32 hour = 4;
    uint32 minute = 5;
    uint32 second = 6;
    uint32 tz = 7;
}
message Created {
    uint64 id = 0;
    optional string comment = 1;
}
enum ErrorPriority {
    ERR_INFO = 0;
    ERR_WARNING = 1;
    ERR_ERROR = 2;
    ERR_CRITICAL = 3;
}
message Error {
    string message = 0;
    ErrorPriority prio = 1;

enum TransactionState {
    TRANS_OPEN = 0;
    TRANS_PAYED = 1;
    TRANS_REVOKED = 2;
}
enum TransactionType {
    TRANS_SELL = 0;
    TRANS_BUY = 1;
}
message TransactionData {
    Timestamp ts = 2;
    TransactionType type = 3;
    Money discount = 4;
    Timestamp expire = 5;
    optional string comment = 6;
}
message Transaction {
    uint64 id = 0;
    TransactionData data = 1;
    TransactionState state = 2;
}
message CommitTransactionRequest {
    TransactionData tr = 0;
    Signature signature = 1;
}
message CommitTransactionResponse {
    optional Created created = 0;
    optional Error err = 1;
}