docs: public static BoxStoragePolicyAssignment.Info create(BoxAPIConnection api, String policyID, String userID) {
          URL url = STORAGE_POLICY_ASSIGNMENT_URL_TEMPLATE.build(api.getBaseURL());
          BoxJSONRequest request = new BoxJSONRequest(api, url, HttpMethod.POST);
          JsonObject requestJSON = new JsonObject()
              .add("storage_policy", new JsonObject()
                  .add("type", "storage_policy")
                  .add("id", policyID))
              .add("assigned_to", new JsonObject()
                  .add("type", "user")
                  .add("id", userID));
  
          request.setBody(requestJSON.toString());
          BoxJSONResponse response = (BoxJSONResponse) request.send();
          JsonObject responseJSON = JsonObject.readFrom(response.getJSON());
  
          BoxStoragePolicyAssignment storagePolicyAssignment = new BoxStoragePolicyAssignment(api,
                  responseJSON.get("id").asString());
  
          return storagePolicyAssignment.new Info(responseJSON);
      }