A map of possible out-of band callbacks related to the parent operation. The key is a unique identifier
for the Callback Object. Each value in the map is a Callback Object that describes a request that may
be initiated by the API provider and the expected responses. The key value used to identify the callback
object is an expression, evaluated at runtime, that identifies a URL to use for the callback operation.
A map of possible out-of band callbacks related to the parent operation. The key is a unique identifier for the Callback Object. Each value in the map is a Callback Object that describes a request that may be initiated by the API provider and the expected responses. The key value used to identify the callback object is an expression, evaluated at runtime, that identifies a URL to use for the callback operation.