I believe the provisioning feature comes with your basic IDN plan. The JDBC rules are connector executed rules so you can upload it without involving professional services
Take a look at the below documentations on creating the JDBC provisioning rule and setting up the provisioning policies. The CRUD operation SQL queries will need to be defined in the JDBC rule.
As @jesvin90 mentioned, it is not like you need to purchase explicitly for JDBC connector. If you have Provisioning feature already (definitely you will have with your basic plan), you can use it.