Try:

(s/def :entity any?)
(s/def ::tx-data (s/coll-of :entity))

well. the entity bit is more a placeholder here. That needs to be further specced. but reitit does not allow non-namespaced keywords.

Assert failed: k must be namespaced keyword or resolvable symbol
(c/and (ident? k) (namespace k))

Swagger generation depends on your coercion, and in the case of spec it will coerce your parameters into swagger docs https://github.com/metosin/reitit/blob/master/modules/reitit-spec/src/reitit/coercion/spec.cljc#L97, and will use spec-tools to do it 🙂

So try wrapping your spec definition with an https://github.com/metosin/spec-tools/blob/master/docs/05_swagger.md#annotated-specs

So you'd declare your body params with something like:

["/transact" {:post {:parameters {:body (st/spec {:spec ::transactions
                                                  :name "Transactions"})}}}]

Maybe that will work? 🙂

Thanks @U01BP1CB37B. That did actually work!