/** GETTER
     * TODO: Write general description for this method
     */
@JsonGetter("product_id")
    public Integer getProductId ( ) { 
        return this.productId;
    }
@JsonGetter("product_id")
public Integer getProductId ( ) {
return this.productId;
}
@JsonGetter("product_id")
public Integer getProductId ( ) {
return this.productId;
}
@JsonGetter("product_id")
public Integer getProductId ( ) {
return this.productId;
}