rpc LastTransaction() returns (TransactionReturn);

    rpc LastTransaction(Login) returns (TransactionReturn);

    int64 value = 0;
    uint64 dec = 1;
    Currency cur = 2;

    int64 value = 1;
    uint64 dec = 2;
    Currency cur = 3;

message Created {
    uint64 id = 0;
    optional string comment = 1;
}

    string message = 0;
    ErrorPriority prio = 1;

    string message = 1;
    ErrorPriority prio = 2;

    double amount = 0;
    uint64 item = 1;
    optional string comment = 2;

    double amount = 1;
    uint64 item = 2;
    optional string comment = 3;

    string name = 0;
    Money price = 1; // default price to use
    Units units = 2;

    string name = 1;
    Money price = 2; // default price to use
    Units units = 3;

    map<string, string> identifiers; // key is system name and value is identifier in that system

    map<string, string> identifiers = 14; // key is system name and value is identifier in that system

    uint64 product = 0;
    double amount = 1;
    Money price = 2;
    optional Money discount = 3;
    optional Timestamp valid_from = 4;
    optional Timestamp valid_to = 5;

    uint64 product = 1;
    double amount = 2;
    Money price = 3;
    optional Money discount = 4;
    optional Timestamp valid_from = 5;
    optional Timestamp valid_to = 6;

    Timestamp ts = 0;

    Timestamp ts = 1;

    optional uint64 customer = 1; // customer tid
    optional Money discount = 2;
    repeated TransactionEntry entry = 3;

    optional uint64 customer = 3; // customer tid
    optional Money discount = 4;
    repeated TransactionEntry entry = 5;

    optional string comment = 0;
    repeated uint64 invalidate = 1; // tid of transaction to invalidate

    optional string comment = 2;
    repeated uint64 invalidate = 3; // tid of transaction to invalidate

    TransactionData data = 0;
    optional Invalidate invalidate = 1;

    TransactionData data = 1;
    optional Invalidate invalidate = 2;

    TransactionData data = 0;
    optional Invalidate invalidate = 1;

    TransactionData data = 1;
    optional Invalidate invalidate = 2;

    TransactionData data = 0;
    optional Invalidate invalidate = 1;

    TransactionData data = 1;
    optional Invalidate invalidate = 2;

    PaymentType type = 0;
    Money amount = 1;
    Timestamp ts = 2;
    optional uint64 customer = 3; // tid of the customer payed

    PaymentType type = 1;
    Money amount = 2;
    Timestamp ts = 3;
    optional uint64 customer = 4; // tid of the customer payed

    string name = 0;
    string address = 1;
    map<string, string> identifiers = 2; // identifers of that customer in different systems
    optional string comment = 3;
    repeated string tags;

    string name = 1;
    string address = 2;
    map<string, string> identifiers = 3; // identifers of that customer in different systems
    optional string comment = 4;
    repeated string tags = 5;

    string name = 0;
    string public_key = 1;

    string name = 1;
    string public_key = 2;
}
message Login {
    string name = 1;
    string signature = 2;

    uint64 tid = 0;
    uint64 parent = 1;
    uint64 user = 2;
    uint64 ts = 3; // unix time in seconds
    string signature = 4;

    uint64 tid = 1;
    uint64 parent = 2; // tid of the parent transaction
    uint64 uid = 3; // tid of the user transaction
    uint64 ts = 4; // unix time in seconds
    string signature = 5;

        Transaction tr = 0;
        Error err = 1;

        Transaction tr = 1;
        Error err = 2;

    uint64 next_tid = 0;
    map<uint64, Transaction> transactions = 1;

    uint64 next_tid = 1;
    map<uint64, Transaction> transactions = 2;