An amount of money in a certain currency
name  data type  constraints  description 

amount  number  required, max digits: 14 (integer), 3 (fraction)  The amount given with fractional digits, where fractions must be compliant to the currency definition. Up to 14 significant figures. Negative amounts are signed by minus. The decimal separator is a dot. Example: Valid representations for EUR with up to two decimals are:

currency  string  required, regex: [AZ]{3}  ISO 4217 Alpha 3 currency code 
Example
{ "amount" : 5877.78, "currency" : "EUR" }