Prerequisites

For the integration, you need to have the Elite platform or both Subscription and Classified platforms. if you have Elite platform skip next step.
copy both platform codes under one place, so that they will be merged.
proceed with the installation process and make sure all modules installed in addition to the desired payment plugins.

Configuration

Once you have your environment up and running, go ahead a and create your subscription product
The recurring product features make sure you create 2 features, one of them to define how many classified products user can create, and the other how many featured ads per each plan
specify the feature values in the plan management.
once you complete the steps above you should have Product Id, Feature Id for Ads count, Feature Id for Featured Products counts.
Under Settings -> Classified, enable subscription classified and fill the Ids you grabbed from the subscription product

Once you have settings configured, the system will check if the end-user has a valid subscription to manage his ads, and will redirect him to subscribe.