There are also multiple ways to build this kind of feature. Balanced is doing it 'the right way,' but you can fake it till you make it, and hope that Visa/MC doesn't get mad at you before you build out the real implementation. That way is also cheaper...
As an example of the benefit of 'the right way,' Balanced will be immediate for a large percentage of cards, rather than the 1-2 days that this page claims.