Re: cant hold it
A very good reason not to mention it is that it would have to be defined. Apart from the wrangling over a definition someone would then come up with a tweak to get round the definition.
Keep the terminology as open ended as possible. "Monetary or non-monetary payment systems" might be a good start until someone argues it's not a payment system. "Monetary or non-monetary means of transferring value"? Sometimes manglement-speak has its place.