defined MoneroTx.DEFAULT_PAYMENT_ID;

initialize incoming transfer isCoinbase, isConfirmed, isFailed,
isRelayed, inTxPool

src/daemon/MoneroDaemon.cpp

@@ -9,6 +9,10 @@
  */
 namespace monero {
 
+  // ------------------------- INITIALIZE CONSTANTS ---------------------------
+
+  const string MoneroTx::DEFAULT_PAYMENT_ID = string("0000000000000000");
+
   // -------------------------- MODEL SERIALIZATION ---------------------------
 
   string SerializableStruct::serialize() const {

src/daemon/MoneroDaemon.h

@@ -62,6 +62,7 @@ namespace monero {
    * Models a Monero transaction on the blockchain.
    */
   struct MoneroTx : public SerializableStruct {
+    static const string DEFAULT_PAYMENT_ID;  // default payment id "0000000000000000"
     boost::optional<shared_ptr<MoneroBlock>> block;
     boost::optional<string> id;
     boost::optional<string> version;