Returns the requested property of a deal. The deal property must be of the string type. There are 2 variants of the function.
1. Immediately returns the property value.
2. Returns true or false, depending on the success of the function. If successful, the value of the property is placed into a target variable passed by reference by the last parameter.
[in] Deal ticket.
[in] Identifier of the deal property. The value can be one of the values of the ENUM_DEAL_PROPERTY_STRING enumeration.
[out] Variable of the string type that accepts the value of the requested property.
Value of the string type.