4.8.5.3. Dynamic Attributes in REST API

REST API supports loading and saving dynamic attributes. In order to load dynamic attributes of an entity instance, add the dynamicAttributes=true parameter to the find or query request:

app-portal/api/find.xml?e=sample$Car-9f789ba9-ca15-4758-a8b8-77e434f1d438&s=9f789ba9-ca15-4758-a8b8-77e434f1d438&dynamicAttributes=true

Dynamic attributes are represented in JSON and XML documents in the same way as regular attributes, except for the preceding + symbol.

REST API also saves dynamic attributes passed to commit.