It goes without saying that each service you develop needs to have decent documentation and if you have no prior documentation standard you can use Zato’s own public service API as a starting point.
A documentation should begin with a short chapter explaining what the services are for in the first place - if confronted with several sources of information at the same time your users should at first glance be able to tell whether your docs are what they need in a given situation or not.
You need a table of contents (TOC) table of contents so it’s possible to quickly locate which service group or domain a service one needs to find belongs to. Groups should be sorted alphabetically in ascending order.
A link from a TOC should point to a general overview of a given service group with a list of links to particular services, sorted alphabetically in ascending order.
A chapter on each service should contain the following:
A brief description of the service
A True/False flag regarding whether the service returns a list of objects
SOAP and JSON URLs, if a service is to be invoked under either
A link to a WSDL document if SOAP should be used
Lists of request and response parameters, each containing:
SOAP and JSON usage examples, if either is used - these should use values that are correct in the formal sense of being in accordance with the underlying data model (implemented as, for instance, XSD Schema for SOAP)
They can be taken from a DEV environment where customer IDs are invalid yet they conform to a given system’s format of such identifiers.
The point being, usage examples are something your users will want to lean on so they should be as close to real messages as it is possible.