public override string Serialize()
{
var builder = new JSONBuilder();
builder.WriteKeyValuePair(FEE_FIELD_KEY, Fee);
builder.WriteKeyValuePair(FROM_FIELD_KEY, From);
builder.WriteKeyValuePair(TO_FIELD_KEY, To);
builder.WriteKeyValuePair(AMOUNT_FIELD_KEY, Amount);
builder.WriteOptionalClassKeyValuePair(MEMO_FIELD_KEY, Memo);
builder.WriteKeyValuePair(EXTENSIONS_FIELD_KEY, Extensions);
return(builder.Build());
}
